Learn about the In/Out's user interface! In/Out is available in 11 languages: English, Français, Español, Português, Deutsch, Italiano, Nederlands, 中文, 日本語, 한국어, and الإنجليزية:

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Home Screen


The In/Out Home screen has four options:

Line Call

Line Call automatically calls balls in or out.

To set up:

In/Out will now call balls depending on its settings.

While in Line Call mode, the screen will show the last ten shots. You can use the left and right arrows to select a particular ball and click on the screen to see a replay of where the ball landed.

If the device is configure for match, all the shots of the last point are shown on screen. The serve is recognized as deuce or ad side with the green serve overlay. The speed of the serve is provided in the bottom right corner.

Important Tip: To change how In/Out responds to out balls (with lights and beeps), visit the Settings -> Signal.

Video Recording

Rec only records your play with both cameras. Press Stop when you are done. To view the videos you have recorded, click on Videos from the Home screen.

If you have a microSD card inserted, In/Out will prioitize it over the internal 4GB memory.

If you long press on the "Rec only" icon, you can modify the options of video recording. You can also access this screen via the "Rec Options" button in the Advanced screen.

Quality and resolution specifications for storing and streaming are the following:

If line calling is processed:

Device Option One side Two sides
Recording Only Normal
Image - Video
1920x1080 @ 45fps
Image - Video
1920x720x2 @30fps
Full view
Image - Video
1280x720 @ 70fps
Image - Video
1280x720x2 @ 30fps
Slow motion
Image - Video
1504x540 @ 110fps
Recording + Line Calling Normal
Image - Video
1920x720 @ 65fps
Image - Video
1920x720x2 @ 25fps
Slow motion
Image - Video
1504x540 @ 100fps

You can stream the video in high quality. On the receiving machine (a PC, a Mac, an Android or iOS device), use preferably VLC and connect to this network address rtsp:// Make sure to be connected to the In/Out Wi-Fi network.

Tip: To enable recording in line calling mode, visit the Settings-> Advanced and toggle "Line Call" to "Line Call + Rec". Note that it will consume more battery.

Version 3.0 hardware has a third middle camera. It can record in 720p@30fps. The resolution will be upgraded to 1080p in a future 2021 firmware update.


The Videos screen allows you to playback previously recorded videos.

If you plug a microHDMI cable into the right side of the Net Device, you can replay the videos in high quality on a TV.

Tip: The percentage numbers on the two top icons tells you how much storage has been used.


The settings section gives access to a lot of settings to tweak your In/Out experience.

Pair Second

If you have a second In/Out, you can pair them together. You only need to do this procedure once. Each device will remember its pair and will reconnect to it automatically when line call is started.

Go to the "Pair Second" screen from the Settings screen on both devices. Once you see the other device, press on its name. The paired device is then highlighted in yellow. Exit the menu and go back to the home screen. The devices will be paired automatically and the status icon will be updated accordingly.

To unpair, go to the "Pair Second" screen on each device NOT AT THE SAME TIME. Press the "Unpair" button and confirm.


The setting allows you to adjust how the In/Out device responds to in and out balls.

Press the left and right arrows to switch between the six settings, and use "Test IN" and "Test OUT" to see how the device will respond when the ball is in or out.

These are six settings:

Custom settings enable you to select exactly how the device should signal when a call is made. There is a close call option so that call IN are made only when the ball is very close to the line.


You can place the device in training mode. The device tells you the percentage of success to the targeted zone, as well as your ITR (Instant Tennis Rating) based on that session. If you are in line calling pratice mode, press on the lower left corner to swap to training:

After making a long press in the settings screen, you can select one of the 12 training zones including serves:

In training mode, if beep is enabled, the device makes one beep when the ball hits the targeted zone, it makes no beep if the ball is IN but NOT in the targeted zone, it makes 5 beeps when the ball is OUT.

Once you have synchronized the device with the cloud, you can access your training result and ITR. Visit the cloud section for more information.


The Advanced screen is shown below:

SSID of the Wi-Fi HotSpot of the device is derived from grand slam winners. In this case, this is Roger Federer. Wi-Fi password is theinout in one word, all small caps.

Alternatively, you can connect the device to an Internet router in the Wi-Fi screen. The small globe is shown if the device can connect to the Internet. If you don't have the globe with WWW, it means that the connection to your router has failed.


The About screen is shown below:


The Wi-Fi screen is shown below:

If you have some trouble to generate the QR Code, you can also download the settings file "wifi.bin" from Copy this file either on a micro SD card and insert it into the device, or plug a USB cable between your PC/Mac and the device and drop the file in the "Video" internal folder.

The current configuration is shown at the bottom of the screen.

Read this page for further information how to connect your device with your local router.


The Tools screen is shown below:

Important Tip: A Hard Reset will wipe out all the internal storage, including all the settings at the exception of the SSID of the Wi-Fi HotSpot.

Device Setup

The Device Setup screen is shown below:

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Power User screen

Hardware v3.0:

Hardware v1.1 and v2.0:

If you press seven times in the middle of the Tools screen, you can access the Power User screen. This screen is for advanced "power" users and offers a few unofficial tweaks and features that will give you more control on the device and that are usually integrated in the next firmware once they have matured enough.

In power user mode, you have access to mutliple "hidden" features. On the preview screen, you can force to report a bad court or you can force line calling by pressing on the sides of the overlay.

You can "debug" how a close line call is made. In red you can see the outer edge of the court line. In blue, you have the detected ball.

You can swap the players. This impacts only the statistics. This option is not available in training mode.

Last, in the line call screen, if you press the very top left corner, you can see the images of the court and how the device is auto-recalibrating itself in case the net has shaken it.

Long press touch

A few features can be enabled with a long press touch on the screen.

On the Home screen:


On the Line Call screen:

Line Call Line Call

Line Device Summary

Line Device Summary

On the Settings screen:


On the Training Zone Settings screen:


on the Advanced screen:


on the Tools screen: