GPS GSM tracker module of high Performance, Low Price 1.Chipset:SiRF star III 2.Cold start time<48 ... sec. 3.Size: 25.4*25.4*3. GPS GSM tracker module with Low ... Two full duplex serial communication, TTL interface, with user selectable baud rate (4800,9600,19200,38400 ... the pulse positive edge 4).Measurements Aligned to GPS second, ±1 microsecond 12. Environmental Characteristics: ...