No. Function No. Function 1, lanyard hole holes 2, 3 restart reset, on / machine key 4, USB charging port 5, GSM indicator 6, GPS indicator 7, SIM card slot (Iphone4 small card) 8, SIM card slot stopper 9, radio hole main function? GSM Quad Band + GPS global positioning? platform / Apple / Android / micro-channel / SMS inquiry location? track playback? electronic fence alarm? 4 sensitivity vibration sensor burglar alarm? sound sensor burglar alarm? ? Remote radio low battery warning prompt card replacement product parameters:? Brand: Rui Feng Wise Model: RF-V8 GSM Band: quad-band network, universal GPS positioning accuracy: 10-15 meters (open sky) Standby time: 12 days shock Alarm: sound sensor alarm: There are built-in battery: Yes (card that is used) Low battery alarm: Alarm has shifted: there is a remote pickup: electronic fence: Yes