3. Getting started

There are big differences in between the smartphone brands and models, their operating systems and updates, which means they do not all work the same way with ACT Head Impact Tracker App. In order to get the event information as soon as possible be logged in ACT Head Impact Tracker smartphone mobile App have it open, no other Apps on top of it, and have screen switched on always when using the head sensor(s) and you wish to get the impact information near-real-time. This is not required in all the phone brands and models, but you can find out about the functionality of yours by testing if the information is transferred when screen is off and/or other App is running on the top.

Some phone brands and models need to activate sensor scanning to get the data from the sensors. You can activate the connection in App’s menu by clicking “Scan sensors”. Please note: you can only get one impact information from one sensor at one scan. You have to activate the scan by clicking “Scan sensors” again. And repeat again and again. We do not recommend using App with mobile device which requires active scanning, when listening to multiple sensors with multiple events (like a team of athletes).

If sensor cannot send information to the App, sensor saves unsent information to it, and you can retrieve it once the Bluetooth® wireless connection in the mobile phone is available and the mobile device is connected to Wi-Fi our mobile data.

1. Buy and insert CR2032 coin cell battery (not included in the sensor but in the USA).
2. Download ACT Head Impact Tracker smartphone mobile App on your smartphone. Please note: The App’s compatibility with all and every smartphone brand and model has not been tested and cannot be guaranteed. There are brands and models which are not compatible with the ACT Head Impact Tracker. Frequently updating list of brands and models tested can be found in FAQ (www.act-tracker.com). If your mobile device is not automatically connecting with the sensors (i.e. an event occurs, you are in Bluetooth® Wireless connection’s reach, but information is not appearing to the App) try with Active scanning. Depending on your mobile device, you might need to always use Active scanning to connect with the sensors. Active Scan works like this: 1.) Click “Menu” (3 bars on the left upper hand corner) > Click “Start active scan” > text turns to say “Stop active scan” = Active scanning is on until you switch it off. Stop Active scanning by clicking on text “Stop active scan”. 2.) When the text says “Start active scan” = Active scanning is off. 3.) If needed, always use active scanning when you want to connect to the sensors.
3. Create a User Account in the App. Your email will act as a User-ID. Make sure to store your password somewhere safe, it cannot be reset.
4. Create a Profile in your User Account to which you want to add the head sensor to. Click “Add profile” and follow the App’s instructions in creating the Profile. Please note: You cannot remove or change the Profile once created.
5. Give App permission to use Location, and “specific Location” if applicable. Give App permission to use Location, and “specific Location” if needed. You also must give App permission to use “Nearby devices” when applicable.
   6. Bluetooth(r)wireless connection must be enabled, on and active in your smartphone with the App always when using it with the sensor(s) and want to get the data in near-real-time.
6. Ensure mobile data and roaming (if needed) are enabled, on and active in your mobile device for the App and always when using it with the head sensor, or that you are connected to Wi-Fi.
7. Remove the head sensor from its package. Open the hatch. Insert the battery to the sensor via hatch on the short side (see illustrated instructions in the end of this document).
   9. Locate the head sensor’s Serial number also acting as Registration code, which is on the product label underneath the battery hatch. Open the hatch and you will find the white sticker on the lid. Registration code is a 6-digit code on the product label.
8. Close the hatch by pressing all sides firmly together to seal the locks. Make sure the sides are seamlessly connected with each other before usage. Please note: Inserting the battery may turn the sensor on, but some components might not turn on. Before usage, switch the sensor off and back on.
9. Turn the head sensor on by pressing the on/off-button once slowly and firmly. The sensor is on when the small red LED light next to the button starts to blink in slow frequency. If the light blinks in high frequency (in fast pace), the battery is almost empty. Change the battery or ACT Head Impact Tracker might not work as intended. If the light does not come on at all or the light comes on, but it is not blinking, try with new battery. If the light still is not coming on at all, or the light comes on, but it is not blinking, the head sensor is not working as it is supposed to and should be replaced.
10. When the sensor is on, choose the Profile you want to add the sensor to and click on it. Click then green button next to “Sensors”, and then the “Add Sensor” button. The App has found the sensor when it says: “Found 1 sensor”. Click “Continue”. The App is connected to the sensor when it shows “Connected to 1/1 sensors”.  Add the Registration code to the line under the text. Click “Continue”. If the App cannot find any sensor, switch the sensor off and back on, and try again. If the App finds more than one sensor, switch off all the other sensors than the one you want to register and try again. Please note: You can register the head sensor only once, and to one Profile only. It is not possible to remove or change the head sensor to another Profile once registered.
11. Follow Apps instructions to complete sensor registration. Please note: you cannot change sensor’s information once registered.
12. When data filling is completed, the App will confirm “Registration is successful”. This means your ACT Head Impact Tracker is ready for action.
13. In the end of each session of use, make sure to switch off the sensor by pressing on/off-button slowly and firmly twice. Wait for one long LED light blink to indicate the sensor is switched off. Doing this will prevent impacts from handling and transportation to be recorded to your impact history. It will also save energy and prolong your battery lifetime.

– ACT Head Impact Tracker is a measuring device to complement doing safe and responsible sports. It is designed for athletes, coaches, trainers and team personnel, co-athletes, families, and friends of athletes.

– ACT Head Impact Tracker head sensor has a built-in automatic switch off in 3 hours after switching it on. If your exercise last longer than 3 hours, remember to switch the sensor back on!

– Head sensor is not suitable for children under 3 years old. Contains small parts. Risk of suffocation!

– Children under 16 years old must use the products and services in adult supervision and must not submit any personal information to ACT Head Impact Tracker products or services.

– ACT Head Impact Tracker needs location services and Bluetooth® wireless connection to be enabled, on and active in the mobile device for ACT Head Impact Tracker smartphone mobile App, and always when using it with ACT Head Impact Tracker head sensor. Otherwise, ACT Head Impact Tracker will not function as intended.

– If smartphone with ACT App runs newer Android OS (Android 12 or newer) you need to give App permission to use “Nearby Devices”. Otherwise, ACT Head Impact Tracker will not function as intended.

– Mobile device with ACT Head Impact Tracker smartphone mobile App must have valid SIM-card or e-SIM with mobile data and roaming (if needed) enabled, on and active, or be connected to Wi-Fi, to enable data transmission from head sensor to the mobile device with the App, from mobile device to the cloud service and from cloud service to the assigned mobile device(s). Otherwise, ACT Head Impact Tracker will not function as intended.

– Be aware of the data transfer range (Bluetooth® wireless connection reach) limitations between the head sensor and mobile device with the App. The range may vary for multiple reasons. Indoors and in other compromised conditions, in the case of an incident keep the distance between the two as short as possible. The range can be less than 10 meters.

Click here to User Manual page

The App is currently available only in Google Play store and smart phones running Android operating system only. The functionality with all smartphone brands and models has not been tested and cannot be granted. There are brands and models which are not working as intended, or not working at all with ACT Head Impact Tracker. Please ensure to check the list of tested smartphone brands and models purchasing ACT Head Impact Tracker head sensor or accessories. You can find the updating listing in “Before you buy” and “General Information”.

Changes and updates in mobile phone brands, models, operating systems and components, as well as changes and updates made to features, functionalities and user preferences may impact on ACT Head Impact Tracker system and functionality. We are working hard to keep our App updated and functional with as many devices as possible, please help us to do so and tell us on the problems you encounter by emailing us at

To use ACT Head Impact Tracker you need to have User Account. This is how your can create one.

1. Go to Google Play store and download ACT Head Impact Tracker Application to your compatible Android smartphone.
2. Choose “Register” on the opening page > Click “continue”
3. Type in your email address to act as your UserID. Ensure there is no autofillings/autocorrections which should not be there to your email address. Please notice, you can not change your UserID once created. > Click “continue”
4. Create a password with minimum 9 characters to it containing small and capital letters and numbers to it. > Click “continue”
5. Retype your password > Click “continue”.
6. Select the country you live in > Click “continue”
7. Read carefully our “Privacy policy “ > > scroll to the end of the document > Add a tic to the box > Click “ok”
8. Read carefully our “Terms of Service” > scroll to the end of the document > Add a tic to the box > Click “ok”

You have created User Account and can add Profile(s) to it.

To add ACT Head Impact Tracker head sensor to your User Account, you have to create a Profile. Please notice: you cannot change the information on the Profile, nor remove Profile once created. Do it like this:

1. Click ”Add profile” on App’s landing page.
2. Give name to your Profile. For data privacy considerations, we recommend not to use real or full names on Profiles. > Click “continue”
3. Give a birthday to Profile. For data security reasons we suggest only to use actual birth month and year, which our company needs to fulfill our legal obligations > Click “finish”.
4. Choose your gender > Click “finish”

You have created Profile to User Account and can add sensor(s) to it.

To add and use ACT Head Impact Tracker head sensor, you have to add it to a Profile on your User Account. Note: you cannot change Sensor information, nor move or remove Sensor once added to Profile. Add head sensor to a Profile like this:

1. Click on Profile you wish add sensor to on App’s landing page.
2. Click on green bullet with +-sign on it on “Sensors” block > Click “Add sensor” so that ”Activate the sensor page opens.
3. Insert battery to the sensor, switch it off and back on > Click ”Continue” > Wait for ”Found 1 sensors” text to appear. > Click ”Continue” > Wait for ”Connected to 1/1 sensors” appear > Type the 6-number serial number also acting as registration code to the line > Click ”Continue” If the App can not find any sensor, switch the sensor off and back on, and try again. If the App finds more than one sensors, switch off all the other sensors than the one you want to register and try again.
4. Choose the sport / discipline the sensor is primarily used for > Click “Continue”
5. Name your sensor or just leave the line blank > click “Finish”
6. Wait for “Configuring the sensor” to be completed before switching off the sensor or App.
7. App confirms “Sensor registered successfully” when registration is completed. Then you can switch off the sensor and can see it in “Sensors” listing on the Profile.

You are now all set and good to go. Sport safely!

Due to differences in smartphone brands and models, their operating systems and updates to them, it is recommended to have ACT Head Impact Tracker smartphone mobile App, logged in, open and screen switched on always when using it with the head sensor(s) and you wish to get the impact information near-real-time.

Unsent impact information will be saved to the sensor and you can retrieve it once the Bluetooth® wireless connection, is active and available, you have given the App permission to use location services and if you have Android 12 or newer operating system given permission to “Nearby devices”, and the mobile device is connected to Wi-Fi our mobile data.

Head sensor measures forces on what it is attached to. Hence we strongly recommend attaching ACT Head Impact Tracker head sensor on a head with a tight-fitting head accessory of user’s choosing, also when used with a helmet. Head bands and Docks specifically designed for the head sensor can be purchased in the webstore in www.act-tracker.com.

Place the head sensor so that its head side (i.e. the side with the foam, on/off-button and led-light) is towards your head. Place the head sensor on the back and side of the head, on the more even area after the ear for example. Do not wear head sensor on an area where direct impacts may occur, like on a forehead, on the temple, or on the back of your head.

The head sensor can be attached to almost any kind of head accessory or wear with hook and loop (Velcro) -tape, or similar.  The back panel of the head sensor has an adhesive surface that you can use by removing the protective film on top of it. We recommend that you use the adhesive surface to attach one piece of hook side of the hook and loop -tape, with which you can attach the head sensor to the ACT Head Impact Tracker headband or other head accessory. Please note that the surface is very adhesive, consider carefully where or what you want to attach to it.

If you consider attaching head sensor to a helmet, refer to your helmet’s User Manual, Owner’s Guide and website. Your helmet’s warranty might be compromised if you attach anything to it. Always follow the helmet manufacturer’s instructions on safe helmet use. Only use a helmet that meets the applicable safety standard when you use a helmet with the head sensor.
Note: If you attach sensor on a helmet, the magnitude measurement accuracy might be compromised, the forces acting on a helmet are many cases higher in magnitude to those acting on your head inside the helmet.

CR2032 coin cell battery will last in ACT Head Impact Tracker head sensor anything between 100-200 hours on-time (i.e. when the sensor is on), depending on the battery used. Same battery will last in ACT Head Impact Tracker Pro between 60-80 hours.