【BIDIRECTIONAL SEARCH FUNCTION】: When the item is not found, click the buzzer buzzer button in the APP to find the item by the sound of the device; when the phone is not found, double click the button on the device, the phone will be an alarm.【ANTI-LOST REMINDER FUNCTION】: When the distance between the anti-lost device and the mobile phone is more than 15 meters, it calls alarm in two directions to remind you to check your goods in time.【POSITIONING FUNCTION】: The device's APP records the position of the mobile phone and the anti-lost device when the Bluetooth is disconnected, so that the items can be traced.【REMOTE CAMERA FUNCTION】: With the long distance control app and the wireless remote control camera, you can easily take self-portraits and group photos.