Features: 1.Bluetooth anti?lost device is a great convenience for searching or locating lost items, easily find your belongings. 2.Connect it to the items you often misplace, save your time searching for things, and keep your life in order. 3.When the anti?lost device is disconnected from phone, the phone application will remind you, and the anti?lost device will also sound alarm to remind you. 4.As long as it is out of range (usually 25m/82.0ft without barriers), your mobile phone and the anti?lost device will beep to remind you. 5.The location function is convenient for you to view the last position of the object on your phone to help you find it. 6.With function of controlling the selfie of phone, can realize the remote control of taking pictures and the recording function of the mobile phone. 7.Low?power Bluetooth technology, standby for more than 6 months, convenient battery replacement, a mobile phone supports up to 8 anti?lost devices at the same time. specification:Item Type: Anti Lost Alarm Sensor Material: ABS Weight: Approx. 14.0g/0.5oz Bluetooth: 4.0 Working Distance: 25m (barrier-free) Battery: CR2032 240mAhx1 (include) Support for iOS/Android Systems: For iOS system above version 11 or higher, for Android system above version 8.0 or higher PackageList:1 xAnti Lost Alarm Sensor 1 x Manual