This app uses iPhone(iphone4s,iphone5,iphone5s,iphone6,iphone6 plus, iphone7,iphone7 plus) and ipads(ipad3, ipad4, ipad air, ipad mini, ipad mini2) bluetooth communication with SOS find me);hardware products(R621), to achieve the bidrectional alarm, data transmission, remote control picture shutter, remote video.etc.