The anti-theft alarm function is a unique built-in function of Lvbu wheel, which triggers an alarm and locks the motor when it is stolen. There is an example below to explain this function: 

Mike finds his bike was stolen by someone. He immediately opens the APP and taps “lost report” on the setting page. And input his email address as an unlock code, he can input this code to unlock the bike once he gets it back. The thief downloads the APP and tries to connect the kit with the APP. When the thief tries to connect to the phone, the location of the thief’s phone is collected and uploaded to the server and meanwhile the motor is disabled. And the thief tries to move the bike, the bike will make a long bleeping sound to alarm

(Note: BT series is an exception because there is no speaker in the controller of BT series).