1、The Bluetooth anti‑lost device is a great convenience for you to search or locate lost items and can easily find your belongings such as wallets, keys,pets, etc. 2、Connect this device to the items you often misplace, use the Bluetooth anti‑lost device to save your time searching for things, and keep your life in order. 3、When the Bluetooth anti‑lost device is disconnected from the mobile phone, the mobile phone application and the Bluetooth anti‑lost device will sound an alarm to remind you at the same time. 4、Convenient for you to check the last position of the object on your mobile phone to help you find it. So you can open the map in the app and predict the approximate location of the lost item. 5、Low‑power Bluetooth technology, extremely low power consumption, standby for more than 6 months, and convenient battery replacement. A mobile phone can manage up to 7 anti‑lost devices at the same time. Item Type: Bluetooth Tracking Device Bluetooth Version: 4.0 Working Distance: 10 Meters Battery: CR2032 240mAh x 1 (Delivered with Battery) Support for iOS/Android Systems: For iOS System Requires Version 7 or Higher;  For Android System Requires Version 4.4 or Higher 1 x Bluetooth Tracking Device 1 x Instruction