Zepp Tennis Sensor (Version 1)

Detailed Zepp Tennis Sensor Review (Version 1)

Zepp tennis sensor is one of the first tennis sensor in the world. It is a small yellow cube which is attached to the end of a tennis racquet handle by a rubber mount or plastic mount. I bought mine in January 2014 and I have been playing with it ever since. It gives me a great basic overview of my game.

Opening the Box

Zepp tennis sensor box

Zepp tennis box from in front.

Zepp tennis box from behind

Zepp tennis box from behind.

Zepp tennis sensor box from the side.

Zepp tennis box from the side.

Zepp tennis sensor box from the side.

Zepp tennis sensor box from the side.

Zepp tennis sensor box

On the top of every box is a hook.

Zepp tennis sensor box

After opening the box’s door we can see the sensor.

Zepp tennis sensor box

Box after we slide out the drawer.

Zepp tennis sensor box

Every part of the box.

Zepp what is included in the box

The box includes (from left to right): charger, Zepp tennis sensor, flex mount, and warranty booklet. Also recently available, is a pro mount which should already be included in the box. If you bought the Zepp tennis sensor package and the pro mount was not included you can still buy the pro mount separately (under accessories).

Zepp flex mount

Flex Mount

Zepp Pro Mount

Pro Mount

Zepp pro mount
Zepp pro mount

I bought my Pro mount separately and it came in the above package. I did not expect two Pro mounts in one package because on the webpage is picture of one pro mount on the handle of the tennis racquet without any description what is in the box.

Weight and Size of the Sensor

Zepp Sensor weight

According to my scale the sensor alone weights 8.0 grams.

Zepp weight of flex mount

The flex mount weights 12.2 grams.

Zepp weight sensor and flex mount

The sensor and flex mount combined weight 20.4 grams.

Zepp sensor size

The size comparison of the flex mount and Zepp tennis sensor with a pen.

Zepp length of flex mount

The sensor exceeds the racquet handle by 2 cm/0.79 inches.

Zepp length pro mount

The sensor mounted by pro mount exceeds the racquet handle by 1.4 cm/0.55 inches.

Zepp weight of the racquet

My tennis racquet alone weights 347 grams.

Zepp weight of the racquet and Zepp tennis sensor

When I added the Zepp tennis sensor to my racquet the weight changed to 367.3 grams.

Zepp weight of pro mount

The Pro mount alone weights 4 grams.

Zepp weight of pro mount with the sensor

Pro mount and the Zepp tennis sensor weight 11.9 grams.

Zepp sensor size

The size comparison of Zepp sensor and the Pro mount with a pen.

Zepp weight of pro mount with the racquet

My tennis racquet weights 358.2 grams with the Pro mount and the Zepp sensor.

Pictures of the Flex Mount

Zepp flex mount
Zepp flex mount
Zepp flex mount
Zepp flex mount
Zepp flex mount
Zepp flex mount
Zepp flex mount

Pictures of the Pro Mount

Zepp Pro Mount
Zepp Pro Mount
Zepp Pro Mount
Zepp Pro Mount
Zepp Pro Mount
Zepp Pro Mount

Technical Specifications

Zepp Tennis Sensor
Bluetooth Bluetooth 2.1
Range 20 – 30 meters
Compatibility iOS 7.0+, iPhone 4S+, iPod Touch 6th Generation+, iPad 2nd Generation+
Android OS 4.0+
NOT for Windows phones
NOT for desktop
NOT for Blackberry
Sensor Dual accelerometers
3-axis gyroscope
Memory Up to 2,000 swings
Battery Rechargeable Lithium Ion battery
2-3 hours full charge cycle
5-8 hours battery life, depends on usage – online or offline mode

Tracking

Zepp tennis sensor works in two modes: Play Tracking Mode and 3D Serve Mode. In Play Tracking Mode we can choose how we want to see our results, either as a numbers or percentages.

Zepp application

Numbers

Zepp application

Percentages

Play Tracking Mode
Forehand Number of forehands per session
Topspin, Flat, Slice
Sweet sport
Power
Backhand Number of backhands per session
Topspin, Flat, Slice
Sweet sport
Power
Serve Number of serves per session
Power
Sweet sport
Other Total swings per session
Total time, active time
3D Serve Mode
Serve Racquet speed
Potential ball speed
Spin
Backswing time
Impact time
3D analyzer figure

User Guide

User guide is available only on the Zepp tennis official website. A user guide is not included in the box with the sensor. The user guide is clear, well organized, and includes helpful images. When we print out the user guide it has a total of 26 pages (user guide from May 19, 2015).

Zepp Tennis Application

Zepp Tennis Application offers us two modes. The first one is “Play Tracking Mode” which records our entire practice or match session. In this mode we can use the sensor in offline or online mode and after our session we can download our data to the application and analyze it. The second one is “3D Serve Mode” which allows us to record and analyze our serve in 3D. It is best to use this mode in online mode for immediate feedback.

Play Tracking Mode

Zepp application
Zepp application
Zepp application

From left to right:

  • Welcome screen.
  • Screen after we log in.
  • When we click on icon in upper left corner we can see which mode our application is in (the application is currently in tracking mode), history, my account, settings, help, and when our application was last updated with the cloud.

Exploring One of My Sessions

Zepp application
Zepp application

On the top of the screen we can see that I played this session on September 30 at 11:21am (Zář is short for Září which means August in the Czech language). The pie in the middle of the screen is showing how many forehands, backhands, and serves I played at that session. By clicking on the icon at the bottom right we can change the result appearance in the pie, in either percentages or in numbers. On the bottom we can see total swings (510), total time (44:38), and active time (22:27) from the session.

Zepp application
Zepp application
Zepp application
Zepp application

By clicking on the “Power” button on the bottom of the screen we can see the power of our shots.

From left to right:

  • This graph is showing the power from all of our shots together (light blue – forehand, dark blue – backhand, green – serve), and it is also showing the maximum (96) and average (56) power.
  • This graph is showing only the power used during backhands (maximum 88, average 58).
  • This graph is showing only the power used during forehands (maximum 96, average 56).
  • And the last graph is showing the power used during serves (maximum 81, average 67).

To see all those graphs we simply slide through the pages.

Zepp application
Zepp application
Zepp application

When we go back to the basic pie and click for example on “Forehand” we come to the page where we can see the pie with the types of spins (topspin, flat, slice) which we played during forehands. Clicking on bottom left icon we see the tennis racquet graph showing us sweet spots during forehands. The sweet spots are divided into four tabs: All, Topspin, Flat, Slice (we are looking at “All” tab).

3D Serve Mode

Zepp application
Zepp application

To change the mode from “Play Tracking Mode” to “3D Serve Mode” our sensor has to be connected to the application for a successful mode change.

Zepp application serve mode
Zepp application serve mode

In 3D Serve Mode it is recommended to use our sensor in the online mode so we can see the results after hitting every serve. The application is showing a virtual figure with the path of our swing and the speed of our racquet. Also, we can tell the application from which side we served – Deuce or Advantage side.

Zepp application

By clicking on the graph icon at the bottom of the screen we come to this page where we can see the summary of every single serve. This page is showing: Racquet speed (72 km/h), Potential ball speed (101 km/h), Spin (10/10 – 0 means no spin, 10 – means maximum spin), Backswing time (1.33 sec.), and Impact time (0.27 sec.).

Zepp application 3D serve
Zepp application 3D serve
Zepp application 3D serve
Zepp application 3D serve

From left to right:

  • By clicking on the arrow pointing down at bottom left corner of the screen we get following menu:
    • Compare – We can compare our serve with the “Pro” serve or we can compare two of our serves together.
    • Share – We can share our result through e-mail, Facebook, or Twitter.
    • Screen Lock – This option locks the screen.
    • Delete – This deletes the serve we are looking at.
  • This screen is comparing my serve (the green path) with the “Pro” serve (gray path). At the top of the screen is the speed of both serves.
  • On the next screen two of my serves are compared to each other.
  • The last screen shows the numbers of the two serves which are being compared.
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve
Zepp 3D serve

There are eight different angles from which we can analyze our serve.

History of Zepp Tennis Application

  • Version 1.0 (13.11.2013)
    • First version of the application
  • Version 1.0.1 (20.11.2013)
    • Bug fixes
  • Version 1.0.2 (22.11.2013)
    • Bug fixes
  • Version 1.0.3 (5.12.2013)
    • Bug fixes
  • Version 1.1 (30.12.2013)
    • New sensor firmware update to improve accuracy.
    • New languages: German, Spanish, French, Italian, Japanese, Korean.
    • Bug fixes and user interface bug fixes
  • Version 1.1.1 (1.1.2014)
    • Bug fixes
    • New sensor firmware update to improve accuracy.
  • Version 1.1.2 (29.1.2014)
    • New firmware update for performance improvements in swing tracking.
  • Version 1.1.3 (6.2.2014)
    • Fixed a bug that caused swing tracking issues between accounts.
  • Version 1.1.4 (7.3.2014)
    • New sensor firmware for improved swing tracking accuracy and swing recognition.
  • Version 1.1.5 (1.4.2015)
    • Bug fixes
  • Version 1.2 (20.5.2014)
    • 3D serve analysis
    • New serve metrics – racquet speed, potential ball speed, spin, and timing.
    • Sweet spot
  • Version 1.2.1 (17.6.2014)
    • Added languages
    • Firmware update to improve 3D swing capture.
  • Version 1.2.2 (14.7.2014)
    • Improved serve and ball spin tracking.
  • Version 1.2.3 (13.8.2014)
    • Update play tracking mode to improve the accuracy of shot classification.
    • Stabilization and bug fixes.
  • Version 2.0.0 (18.5.2015)
    • Match and practice analysis
    • Instant analysis of your intensity, consistency, and power.
    • Personalized session reports + tips and drills to improve your game.
    • Benchmark your practices and matches, set goals and track your improvements over time in both singles and doubles.
    • Video training center – Milos Raonic and top coach share video tips, drills, and match strategy.
    • Step-by-step tutorials
  • Version 2.1.0
    • Minor updates and bug fixes
  • Version 2.2.0
    • New subtitles added in Spanish, French, German, Italian, Chinese, Japanese, and Korean.
  • Version 2.2.1
    • Bug fix
  • Version 2.2.2
    • Fixed Focus Screens in Serve Tracking on iPhone 6s and 6s Plus.
  • Version 2.2.3
    • Bug fix
  • Version 2.2.4
    • Bug fixes and performance improvements
  • Version 2.2.5
    • Use this free app to enhance your training experience by pairing the app with the square Zepp 1 sensor. The round Zepp Tennis 2 sensor is supported by the new Zepp Tennis app.

Updating the Firmware of the Sensor (Version 1.2.3)

If newer firmware is available for the sensor, a yellow “UPDATE” sign will show up next to the “Settings”. To update the firmware, follow the steps on the screen. To update mine it took less than a minute.

Zepp update firmware

Pros and Cons of Zepp Tennis Sensor

Pros Cons
Sensor is water resistant Sensor is not easy to turn on/off
Sensor is well built The size and the weight of the sensor
Sensor can be used for multipe sports (tennis, golf, baseball, and softball) The LED channel is hard to see outside (especially during sunny days)
Sensor’s warranty is one year The sensor sometimes flies off the flex and pro mount
Battery life (more than 5 hours) The flex mount is exceeds the handle to much
Free application Sensor requires calibration before every session
Sign in on multiple devices at once Syncing with the cloud takes a long time
Approved by ITF Synchronization between devices does not work well
“3D Serve Mode” does not divide serves in one day into a separate session.

Tips

Tip 1

Mounting Zepp tennis sensor

I like to put the flex mount under the over grip for a better feeling.

Tip 2

I was playing with my Pro mount for about three hours and all of a sudden the Pro mount with the sensor flew off my racquet.

Zepp
Zepp

Most of the tennis racquets have sticker with its brand on the top of the cap, in my case Tecnifibre. I put the Pro mount on the top of this sticker and the sticker flew off with the Pro mount and the Zepp tennis sensor after about three hours of playing. This sticker is well glued to the top of the cap, but it is not glued well enough to put something on top of it. In the left picture we can see the cap without the sticker and in the right picture we can see the sticker alone.

Zepp pro sensor
Zepp pro sensor

Here we can see the Pro mount with the brand sticker. The Pro mount holds really well on the racquet so if you have the brand sticker on the butt cap of your tennis racquet I would remove it and stick the Pro mount on the butt cap without the brand sticker.

Zepp

By doing that you will save one gram of weight and also the sensor will not stick out of your racquet as much.

Sensor From Inside

Zepp tennis sensor from inside
Zepp tennis sensor from inside
Zepp tennis sensor from inside

Playing with the Sensor

Before every session I calibrated the sensor as instructed. I played ten shots every session.

Video from the session: Zepp Tennis Sensor Accuracy

Play Tracking Mode

  • 10 Forehands Flat:
    • The application recorded 10 forehands flat.
Zepp forehands flat
Zepp forehands flat
  • 10 Forehands Topspin:
    • The application recorded 8 forehands topspin and 2 forehands flat.
Zepp forehands topspin
Zepp forehands topspin
  • 10 Forehands Slice:
    • The application recorded 9 forehands slice and 1 serve.
Zepp forehand slice
Zepp forehand slice
  • 10 Backhands Flat:
    • The application recorded 10 backhands topspin.
Zepp backhand flat
Zepp backhand flat
  • 10 Backhands topspin:
    • The application recorded 6 backhands topspin, 1 backhand slice, and 3 forehands.
Zepp backhand topspin
Zepp backhand topspin
  • 10 Backhands slice:
    • The application recorded 10 backhands slice.
Zepp backhand slice
Zepp backhand slice
  • 10 Serves:
    • The application recorded 10 serves.
Zepp serves

3D Serve Mode

  • 3 Flat Serves:
Zepp Flat Serve
Zepp Flat Serve
Zepp Flat Serve
  • 3 Slice Serve:
Zepp slice serve
Zepp slice serve
Zepp slice serve

Video of the Accuracy from the Practice

I was recording myself on video camera during part of my practices while I was playing with the Zepp 1 sensor. After the practice I took the data from the sensor and the recorded data from the video and I compared them. The sensor records volleys as normal shots so I always add them together.

How it works:

  • Data Recorded – Real data from the session. I watch the video, and do marks (Accuracy sheet) for each type of shot I play. On the end I count every mark and put the results together.
  • Sensor Recorded – Data recorded by the sensor. After the table are always shown screen shots from the application.
  • Difference in % – Percentage difference between “Data Recorded” and “Sensor Recorded.”
  • Total Difference in % – Total percentage difference between “Data Recorded” and “Sensor Recorded.”
  • Notes – In this section are written all the notes from the session.
  • Video from the session – Link for the video from the session is provided.
  • Accuracy sheet – Accuracy sheet is showing the marks for every shot, which I made watching the videos (Data Recorded).
Session 1 (April 22, 2015)
Application version 1.2.3, mounted by flex mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 229 234 1.08% 1.16%
Backhands 134 + 1 = 135 129 2.27%
Serve 0 0
Total 364 363 0.14%
Volley Forehands 0
Volley Backhands 1
Smash 0
Notes
During this session the sensor was in offline mode.
Video from the Session 1: Zepp 1 – Session 1
Accuracy sheet from Session 1: View
Zepp Session 1
Zepp Session 1
Zepp Session 1
Session 2 (May 28, 2015)
Application version 2.0.0, mounted by flex mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 364 216 25.52% 31.80%
Backhands 229 104 37.54%
Serve 35 1 94.44%
Total 628 321 32.35%
Volley Forehands 53
Volley Backhands 46
Smash 12
Notes
This Session was recorded in offline mode.
During the session my string broke.
I only transferred the sensor to the new racquet without recalibrating the sensor.
I am missing the last part of the video where I was serving.
Video from the Session 2: Zepp 1 – Session 2
Accuracy sheet from the Session 2: View
Zepp Session 2
Zepp Session 2
Zepp Session 2
Session 3 (June 3, 2015)
Application version 2.0.0, mounted by pro mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 30 30 0.00% 0.00%
Backhands 21 21 0.00%
Serve 19 19 0.00%
Total 70 70 0.00%
Volley Forehands 30
Volley Backhands 21
Smash 19
Notes
In this video I am playing only volleys and smashes to demonstrate
that the Zepp 1 tennis sensor is recording volleys as normal shots (forehand volley is recorded as
forehand, backhand volley is recorded as backhand, and smash is recorded as serve).
Video from the Session 3: Zepp 1 – Session 3
Accuracy sheet from the Session 3: View
Zepp session 3
Zepp session 3
Zepp session 3
Session 4 (June 7, 2015)
Application version 2.0.0, mounted by pro mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 271 272 0.18% 0.22%
Backhands 189 190 0.26%
Serve 0 0 0.00%
Total 460 462 0.22%
Volley Forehands 0
Volley Backhands 0
Smash 0
Notes
I was picking up balls with my racquet – sometimes the Zepp sensor counted that as a shot.
My phone was behind me.
During this session the Zepp application shut down, and I had to restart it.
I was using the sensor in live mode.
At the end of this session my phone died so I stopped the session. I think when this happens the
Sensor automatically switches to an offline mode and still recording the shots.
Video from the Session 4: Zepp 1 – Session 4
Accuracy sheet from the Session 4: View
Zepp Session 4
Zepp Session 4
Zepp Session 4
Session 5 (June 8, 2015)
Application version 2.0.0, mounted by pro mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 364 357 0.97% 1.08%
Backhands 224 220 0.90%
Serve 30 31 1.64%
Total 618 608 0.82%
Volley Forehands 41
Volley Backhands 15
Smash 17
Notes
During this session I was not picking up balls using my tennis racquet.
My phone was behind me.
Sensor was in live mode.
Video from the Session 5: Zepp 1 – Session 5
Accuracy sheet from the Session 5: View
Zepp Session 5
Zepp Session 5
Zepp Session 5
Session 6 (June 10, 2015)
Application version 2.0.0, mounted by pro mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 360 153 10.35% 63.62%
Backhands 247 54 64.12%
Serve 14 0 100.00%
Total 621 207 50.00%
Volley Forehands 32
Volley Backhands 24
Smash 14
Notes
During this session I was picking up balls using my tennis racquet.
The Zepp tennis sensor moved couple of times in the pro mount during the session.
Video from the Session 6: Zepp 1 – Session 6
Accuracy sheet from the Session 6: View
Zepp session 6
Zepp session 6
Zepp session 6

Session 7

Session 7 (June 10, 2015)
Application version 2.0.0, mounted by pro mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 275 271 0.73% 0.76%
Backhands 190 185 1.33%
Serve 8 8 0.00%
Total 473 464 0.96%
Volley Forehands 22
Volley Backhands 18
Smash 8
Notes
During this session I was not picking up balls using my tennis racquet.
Zepp tennis sensor flew off the pro mount during the recording of this video.
Video from the Session 7: Zepp 1 – Session 7
Accuracy sheet from the Session 7: View
Zepp session 7
Zepp session 7
Zepp session 7

Session 8

Session 8 (August 10, 2015)
Application version 2.1.0, mounted by flex mount
Type of Shot Data Recorded Sensor Recorded Difference in % Total Difference in %
Forehands 502 502 0.00% 0.15%
Backhands 514 510 0.39%
Serve 21 21 0.00%
Total 1037 1033 0.19%
Volley Forehands 1
Volley Backhands 7
Smash 0
Notes
Before this session I did not calibrate the sensor.
I played this session with flex mount but in the Zepp application I had set pro mount.
Even though my phone was overheating on the sun the Zepp sensor was still counting the shots.
I synced everything whenever the phone cooled down.
Video from the Session 8: Zepp 1 – Session 8
Accuracy sheet from the Session 8: View
Zepp Session 8
Zepp Session 8
Zepp Session 8

Technical Support

My zepp tennis sensor broke after one year of use, and this was happening to me: When I turn off the sensor after two seconds all ten led lights went on and stayed on until I didn’t push the multifunction button for a longer time (at least 8 seconds) to turn off the sensor. When I again turned on the sensor it acted normally, but I could not pair it with my iPhone. So I e-mailed the Zepp tennis technical support at support@zepplabs.com

The next day I got this response:

“Hello Martin, From your description it appears the sensor is having internal issues and may be defective. If purchased the unit from a retail store, please return it to the store for a replacement. If you are unable to return the product to where it was purchased due to it being out of the return window or if it was purchased from our website we’ll expedite a replacement. We’ll just need you to confirm your shipping address and we can have a RMA label sent to you to get the device sent back to our office for additional testing. We apologize for this inconvenience and thank you for your patience. Regards, Greg Zepp Support Team”

I replied that I bought the Zepp tennis sensor online and provided them with my shipping address.

In two weeks I got a new Zepp tennis sensor in my mail, but I did not receive the replacement unit so I e-mailed the Zepp support again saying that I got the sensor without the replacement unit, and asking them what should I do with the old not working sensor.

They replied me this:

“Hi Martin, Unfortunately we do not have a retrieval method to get units back from the Czech Republic at this time. That said, we recommend that you dispose of the faulty unit according to your cities policies. Please feel free to let me know if you have any additional questions, comments or concerns as i’ll be happy to help. Regards, Marcus Zepp Support Team

Conclusion

Mounting of the sensor:

Flex mount is not very easy to install to the racquet, it needs some practice. When it is installed player can feel it in the hand while playing. While playing sometimes happens that the sensor just flies off the flex mount. Also it is heavy (12.2 grams).

Pro mount is little better than flex mount but once it is installed to the racquet it cannot be uninstall since pro mount is fixed to the racquet by the sticker. Still sensor once a while flies off the racquet during playing.

Weight of the sensor:

Sensor with the flex mount weight 20.4 grams and with the pro mount 11.9 grams – the sensor is changing a lot the weight and the balance of the racquet. By installing the sensor to the racquet we are changing its characteristics a lot.

Based on the data:

When the application 2.0.0 was realized there was a mistake in offline mode of the sensor – it would miss lots of shots from the sessions (Session 2, 6).

If you forget to calibrate the sensor before playing not much will happen. Based on the testing it does not have obvious effect on accuracy of the sensor.

In the application we can set if we are using flex mount or pro mount. In case we forget to change this options to the correct mounting option – it will not have obvious effect on accuracy of the sensor.

The sensor is counting shots even though tennis balls are picked up using the racquet.

My opinion:

In my opinion it is a great tool for amateurs who want to have fun and see something more from their game. Zepp tennis sensor and everything around it is well designed (application, webpage). In my opinion the sensor alone is too big and too heavy for a tennis racquet. Mounting the sensor to the racquet with the flex mount needs some practice and the flex mount is very uncomfortable on the racquet. Overall it is not bad product for players who want to see basic information from their game.

By | 2018-03-30T04:52:09+00:00 March 25th, 2018|Zepp|0 Comments

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