1. Using the Bluetooth 4.0 technology, the power consumption is extremely low, the button battery CR2032 is powered, and the replacement is also very convenient. 2. Support iOS system 11.0; Android 8.0 and above systems (must use mobile phone Bluetooth 4.0 and above) 3. Object finding function: Bind the anti-lost device with valuables. When the device is connected to the mobile phone APP Bluetooth, use the APP's search function to make the anti-lost device make a sound to find the item. 4. Find mobile phone function: When the device is connected with the mobile phone APP Bluetooth, when you need to find the mobile phone, double-click the device button to call the mobile phone, the mobile phone make a sound. 5. Two-way alarm: Turn on the "Bluetooth disconnection alarm" switch in the software to realize two-way anti-lost. When the device is connected to the mobile phone APP Bluetooth, if the mobile phone and the anti-lost device Bluetooth are disconnected, both the mobile phone and the anti-lost device sound an alarm, and the item be lost, and the alarm remind you. Selfie function: When the device is connected with the mobile phone APP Bluetooth, use the software's Selfie function to take pictures wirelessly. Recording function: Double-click the switch button of the device to record in the APP. Disconnect location: When the item is disconnected from the mobile phone APP Bluetooth, the APP record the lost location of the item after disconnection, and the lost location be displayed on the map in the APP. colour: black Material: plastic Size: 34x38x8mm Package Contents: 2 x GPS Tracker. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.