Features: Function: Real-time GPS/AGPS/WIFI/4G CAT-1, Positioning, -SOS, Voice Monitoring, Voice Reorder to APP, Call Family Numbers, Pedometer, Geo-Fence Alarm Reminder, historical track, Alarm Clock, Class Mode, Power-Save Mode. Multiple positioning mode: GPS+AGPS+Wifi+Beidou+LBS. Two way call: when the phone book number calls, it can talk with the user. Find a device: If the device is lost, you can find the device through the mobile phone APP. Equipment alarm clock: set through the mobile phone APP. Electronic fence: delimit an area on the map with the equipment as the center, and give an alarm immediately after leaving the area. Specifications: Material:PCB SIM-slot:Support NANO-sim card GPS Positioning Accuracy:Within 10 meter outdoor WIFI Positioning Accuracy:Within 50 meters GPS Positioning-Time:Cold Boot-38s(Open field), Warm Boot-2s(Open field),The specific-time is affected by the environment Battery:3.7V 800mAh Size:Approx.25x35x3.8mm/0.98'x1.38'x0.15' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x GPS Tracker