This app uses iPhone (iPhone 4s, iPhone 5,iPhone 5c, iPhone 5s, iPhone 6,iPhone 6 plus, iPhone 6s, iPhone 6s plus, iPhone 7, iPhone 7 plus)/iPad (iPad 3，iPad 4,iPad Air, iPad Air 2,iPad mini, iPad mini 2/3/4) /iPod touch 5/6 bluetooth communication with Angel Alert wireless tags. Signal alarm when tag goes out of rang e of phone. Find tags when within range by triggering alarm from phone. Remote control camera using tag.
Continued use of GPS running in the background can dramatically decrease battery life