This anti-lost device is a product based on the latest Bluetooth 4.0 low-power technology. By using APP software and Bluetooth connection with mobile devices such as mobile phones, it is easy to lose items and valuables (such as keys, handbags, etc.). Bundled together, to achieve the anti-lost reminder of the item, to find the function of the mobile phone, and also to remotely control the camera, recording and other functions (such as: party photo, self-timer, etc.). The anti-lost device can effectively use the distance, up to 15 meters in the open range, even you can use it on your baby or pet, you no longer have to worry about losing them. Two-way alarm - When your mobile phone is connected to the anti-lost device, if you only bring your mobile phone when you go out, and leave the anti-lost device about 15 meters away, the mobile phone and keychain will alert you. Two-way search - When you leave your mobile phone or anti-lost device (with the easy-to-drop object) at home, you can find the phone through the anti-lost device, or you can find the anti-lost device on your mobile phone. Positioning search - If you don't pay attention to the lost item after the reminder, you can check the lost position through the positioning function in the APP, that is, the position disconnected from the phone. Material: ABS Size: 42*40*10mm Color: as shown Working distance: about 15m (accessibility) Battery1*CR2032 Button BatteryInclude CompatibleSuitable for iP 11 and above Android 8.0 and above. Package:1 x Pet Bluetooth Tracker