Description: Anti-lost: This key for finder can help you find your lost objects, just check the location on your smartphone, then track and fine your small items. Reverse for finder: This key for finder can also help you find your phone, just double click the key for finder, then phone will make reminder. Portable: This anti-lost keychain is small and lightweight that makes you can easily carry or store it, and can be put almost anywhere. Auto alarm: This bluetooth-compatible 5.0 key for finder will send alarm sound when it leaves a certain of distance to remind you. Easy to use: This anti-lost is suitable for connecting with most types of phones and you can check its location on the phone map. Specification: Color: Black, white, orange, light pink, dark blue. Bluetooth-compatible version: 5.0. Effective distance: Approx. 15m/49.21ft. Supported OS: Replacement for iOS, replacement for Android. Standby time: 6 months. Battery: CR2032(Built-in). Size(LxWxH): Approx. 38x38x7mm/1.50x1.50x0.28 inch. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: 1 Piece Anti-lost Tracker(with 1 Piece User-manual).