Promotional Bluetooth Finder Keyrings adopts latest Bluetooth 4.0 low consumption technology, and with a corresponding app/apk to realize all the functions. It can effectively protect your kids, seniors, pets or valuables form being stolen or loss within 7-30 feet effective distance range. When out of this range, your phone and this tracker will automatically and simultaneously ring for a timely warning. It can also be used as an excellent remote control seflie shutter and voice recorder. The location function is extremely handy for road nerds to exactly find their cars. The ultra small size and light weight ensure maximum convenience and portability.