iTag - How to read serial number and send command to make them beep?

I am referring to devices of this type, or similar
How to read the identification code and send a command from the Android app to make them beep?

What have you tried ?

You will need to connect to the device by bluetooth, then send the correct codes in order to activate the device.

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RFID is probably something you may want to look into...
Edit: RFID requires neither barcode nor contact to function.