... service) Specification of anti-theft gps tracker:1. Sirf3 GPS module (20 channels)2. Support GSM/GPRS (850/900/1800/1900MHz ... working time is about 3.5 hours)Accessoriesdevice, Connecting cable ,GPS antenna ,GSM antenna, Engine controller, SOS button, MicrophonePorts:RES: Reset Button1: DC ... : Reset Button1. Quick flash is initialization. It shows GPS and GSM Abnormal. 2. 1 second on, 1 second off ...