Features: This loss device is a product based- on Bluetooth-compatible technology. When the phone and the tracker exceed- the default- effective distance, a two-way automatic alarm-, searches the owner to prevent loss. The tracker is small in size and lightweight, you can bring this anywhere to track your things. Through the use of APPlication software and mobile- phones and other mobile devices for Bluetooth-compatible connection, it can bundle the items and valuables (such as keys, handbags, etc.) that users are easy to lose together, and realize the functions of loss reminder, two-way search... Although the setting steps-- of Android-phones of each brand are different, they are- almost the same. First check the power- saving mode- of your mobile phone system, and add the loss device application to the white list or protected program to prevent the loss device application from being shut down by the system- and causing false alarm. Specifications: Material: ABS- Size: Approx.30x57mm/1.18x2.24inch Color: Black, White, Green, Blue, Pink (optional） Package Includes: 1x Anti-loss Device note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.