GPS GSM tracker module of high Performance, Low ... . 3.Size: 25.4*25.4*3. GPS GSM tracker module with Low Price, High Performance, International Approvals, Prompt ... 1).Two full duplex serial communication, TTL interface, with user selectable baud rate (4800,9600,19200,38400,57600 ... At the pulse positive edge 4).Measurements Aligned to GPS second, ±1 microsecond 12. Environmental Characteristics: 1). ...