Locating ways: GPS+LBS+AGPS +WIFI Vibrate on Ring for incoming call remind Two way audio communication Mute automatic answering calls for voice monitor Low battery & SIM card change reminders 2G GSM: 850/900/1800/1900MHz GPRS Standard: Class 12, /IP Application: Personal tracking, child tracking, aged tracking, Pet tracking, Asset tracking, Vehicle tracking, Management , Kidnapping,blackmail or other emergency situation, Patients, Lone worker, Outdoor activities, mountaineering,exploration Real-time tracking GPS locating time: 60sec with cold boot (open ) GPS positioning accuracy: 10-15m (open ) WiFi positioning accuracy: 15-100m (wifi area) LBS positioning accuracy: 100-1000m Working humidity:5% ~ 95% RH Battery capacity: 400mA Colour:Black+orange Material:plastic Size:40.5x43.3x13.8mm Package Contents: 1 x SOS Fall Alarm Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.