*Network: GSM 850/900/1800/1900MHz, GPRS Class 12*Positioning modes: GPS + AGPS + Wifi(optional) + LBS*Tracking System: APP + Web + SMS*Track + Historical Trace Playback + Geo-Fence*Voice Recording + Pick up + Sound Call Back*Support one/two ways SOS communication(GPS SIM card airtime is required), similar like phone talking*GPS location accuracy: within 10 meters outdoor(may be affected by the environment)*Wifi location accuracy: within 50 meters(optional for some models)*LBS location accuracy: above 100 meters*Working Temperature: -2045/ Humidity: 5%95%*Dimension and Weight53.3*23*19mm, 28g (without collar)