Solution Spreadtrum SC8521E，1.2GHz Dual-core ARM CortexTM A7MP 
GPS SC8521E,  L1,1575.42MHz C/A code
GPS Accuracy 5-30m
Wifi Accuracy 30-50m
LBS Accuracy 100m above
WIFI Wireless 802.11 b/g/n 
Video Call By  APP
Bluetooth 4.2
Memory RAM:512MB; ROM:4G
Location GPS，AGPS，LBS，WIFI
2G Network GSM B2/3/5/8
3G Network WCDMA B1/2/5/8
4G Network "LTE: B1 B2 B3 B4  B7 B8 B12(17) B20 B28A   
（or LTE: B1 B3 B5 B7 B8  B38 B39 B40 B41)"
SIM card Nano SIM card
Calling 3 SOS + 15 phone number
SOS Support
G-sensor Support  (in three axis)
Remote monitoring Support
Camera 0.3MP pixels  (2.0MP in option)
Waterproof level IP67
Battery Lithium battery 650mAH, working life 1.5 days
Dimension 232*42.5*15.8mm
Accessories USB Charge cable (Pogo pin)  and user manual
Other features Electronic fence (GEO),History tracking,Alarm clock,Find watch , phone book, working mode, Remote shutdown watch, support APP for Android and IOS smartphone.