Main Features: The smallest watch GPS tracker in the world! Its watch design will satisfy your loved girls . T80G GPS Wrist Tracker is a stylish device with built-in GPS and GSM modules and high performance antenna. System operation is both by SMS and monitoring center (GPRS). LCD screen display system setting, date and time. Functions： (1)The most advanced GPS module in the world； (2) Works worldwide! Support 3 or 4-frequency：GSM 850/900/1800/1900 MHZ； (3)Two way for data transfer： SMS，GPRS； (4)real time tracking； (5) SOS button send out exact location for immediate rescue/action； (6) Independent SOS button which will send GPS information via SMS to 1 preset cell phone number or send alarm to monitor center (7)Continual location reporting (8) Parameter is setted via SMS (9) Low battery notification before the battery runs out! (10) Speed limit alarm (11)LCD screen show time and system setting (12)Design for girl (13)It has data logging function and records up to 20400 way points. (14)Set Geo-fence alarm. When the T80G move out preset scope, T80G will send one Geo-fence SMS to the SOS preset number. (15)With A-GPS Function. Technical parameter： GSM/GPRS: (1) GSM Antenna：Built in (2) Protocol: Support TCP transmission GPS: (1)GPS Antenna：Built in (2) Accuracy：1-5m Electronic: (1) Operating Voltage：3.4-4.5V (2) Charge voltage：4.5~5V (3) Standby：15mA (4) Operating：80mA (5)Battery Li-ion：600mAh (6) Stand-by time：48hours Package: (1) Main Part Size： 46mm*36mm*18mm