The iHunt Fall Call engages between a TreeSpider Safety Harness and the tree strap. Should you fall, the strap's breakaway threading separates, removing the micro USB from the device. Fall Call sends a Bluetooth message to your smartphone. Your phone's iHunt app will automatically dial your preprogrammed emergency contacts in the priority order you've specified. If a contact does not answer the call, the device will move on to the next contact. You can program emergency responders into your call list or your contacts can notify them and direct them to you whereabouts hands free.