Portable Size: Key finder. Wallet finder. Bag finder. Umbrella finder. It will alert you when you go out of range, so you don't have to worry about leaving without the things you need. Connecting Using: Press the button for a few seconds.It will turn on after you hear two beeps. Then use cellphone's Bluetooth to search and connect the device, if you lost your cellphone, double press the tracker button, your phone would alarm.One phone can collect up to 4 trackers.