GPS tracker : Key finder uses BT 4.0 technology to connect Android, iOS, iPad and other smart phones. Show the lost car key, luggage, wallet, dogs, cats distance from you on the APP to let you find them accurately. APP remotely control: Download free APP then pair it with your smart phone. When you press the remote button, the receiver sos "beeps" you can hear voices from GPS tracker within 85 ft. 4 pack GPS tracker locator contains black, green, white, pink,white for kids, pets, phone. Multi-function:Anti-lost alarm, GPS tracking device, remote control self-portrait. Works as a remote shutter for self-portrait, You can remote control the smart phone camera of your with press on the finder button. Two-way notification:the 2-way key finder will lets you track lost items or be notified when they are out of range with a ring or flash.This feature can be turned off in the app Location Record Locator- iFindU App has real time location map, and will record the last connected location to help you find it back. so you can open the map in the App to speculate approximate location of your missing items.