Cube Tracker Key Finder, Phone Finder, Replaceable Battery, Waterproof Attach CUBE to anything and use CUBE Tracker App to find your Item fast Taking family photos? Use CUBE as a shutter button for your phone camera Lost your Phone? Use your CUBE to locate your phone with ring, vibrate, and flash, even if the app is not running No need to replace CUBE each year. Just replace battery yourself once a year. Extra battery included Simple CUBE Tracker app will show last known location on a map, uses Bluetooth to tell if you are near or far, press find and CUBE will ring. Also has a separation alarm to alert you if you left something behind. Lost your Phone? Use your CUBE to locate your phone with ring, vibrate, and flash, even if the app is not running Taking family photos? Use CUBE as a shutter button for your phone camera