Keyestudio 4DOF Manual page 163

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There are 10 control keys on the App. When connect well the HC-06 Bluetooth
module to Android phone using our APP, press the control key, Android phone will
receive a corresponding value.
When programming, you can set the function for the corresponding value. So in
the experiment, we will test each key to get the corresponding value.
Installation Steps for Android system:
APP for Android mobile：
Enter google play，search "keyes arm".
https://play.google.com/store/apps/details?id=com.keyestudio.keyes_arm
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Note: Allow APP to access "location" in settings of your cellphone
when connecting to Bluetooth module, otherwise, Bluetooth may not
be connected.
This are operating steps as below, the interface for Android and ios system is
same.
Android System:
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