Wireless, Bluetooth 4.0, alarm tracker, key finder, GPS locator, automatically rings if device are outside of a 25m radius, prevents items from getting lost, can be used as a selfie stick remote. Features include: parking site searching voice recording anti-lost remote shutter battery includes instruction Manual: It is recommended to read the user manual carefully and keep it for future reference packaged in a box Specifications: bluetooth: 4.0 low energy consumption compatible device: iOs 7.0 and up-grade version and Android 4.3 version and up-grade version working distance: 25m ( outdoor environment ) battery: CR 2032 lithium coin battery ( included )