Working based on existing GSM/GPRS network and GPS satellites, this product can locate and monitor any remote targets by SMS, APP and Internet. It adopts the most advanced technology of GPS and AGPS dual positioning. Features: Real-time tracking. Movement/speeding/low power alarm. GPRS mode and sms mode Compatible. SOS button, help you get help in emergency circumstance. Remote voice monitoring. Geo-fence protection. Add GPX history route record, can checking in Google map. Add AGPS function,receive GPS signals faster. Specifications: Network: GSM / GPRS Band: 850 / 900 / 1800 / 1900MHz GPS accuracy:5m Work voltage:110220V input 5V output GPS locating time: 45s ( cold start ), 35s ( warm start ), 1s ( hot start ) Package Size:12*10*5cm/4.7*3.9*2in Package Weight: 75g/2.6oz Package List: 1 * TK102B Car GPS Tracker 1 * English Manual 1 * USB Cable Note: Please make sure your SIM card is 2G or compatible with 2G GSM network.