Why choose this GPS tracker? Our GPS location combines many functions such as security, tracking, monitoring surveillance, emergency alerts and management. Great for tracking vehicles, children, spouses, seniors or assets. Usage: 1. Insert the available activated SIM card into the tracker, then real-time tracking and maps via the Internet (using Google Maps) 2. Monitor by sending SMS to the tracker 3. Send 000 to connect your cell phone to the tracker GPS 4. Send 777 Receive location via Google Maps link 5. Send 102 Get link to download app and username and password (http://gpsui.net) 6. Send 555 to start recording 7. Send 666 to stop recording and switch to sound sensor mode. In this mode it will call your cell phone if there is sound above 40db around the device. 8. Send 445 to delete the recording on the TF card 9. Send 444 to reset phone number 10. Send 888 to check GPS status (battery, signal) and TF card storage, etc.) 11. Send 999 to restart GPS Specifications: Color: Black Size: Approx. 1.37*0.78*0.55 inches (L*W*H) Material: ABS Antenna type: GSM GPS Positioning accuracy: about 100m Battery: 3.7V 300mA lithium battery battery Operating time: about 100 hours Standby time: 12 days. Working time 4-6 days Packing list: 1*mini tracker 1*USB cable 1*manual Note: Charging needs to insert SIM card, otherwise it can not be charged.