This anti-lost adopts latest bluetooth 4.0 low consumption technology, and through corresponding app to realize all the functions. It can effectively protect your kids, pets or valuables form being stolen or lost within 25m effective distance range, when out of this range your phone and this iTag will automatically ring for a timely warning. It can also be used as aexcellent remote control seflie shutter and recorder. The location function isextremely perfect for road nerds to exactly find their cars.Benefiting from the built-in low consumption bluetooth 4.0,the battery can last for about 1 year. What's more you can preset 8 devices inone phone at the same time. The ultra small size and light weight ensures maximum convenience and portability.