Uses U-BLOX NEO-6M module, with high gain active antenna, TTL level, compatible with 3.3V / 5V system; Default baud is 38400, can change into 9600 with jumper; With IPX interface, can connect various active antenna; With rechargeable backup battery; Application: Navigator, 4-axis aircraft positioning; Connection (as connect MCU example): VCC connects 3.3V / 5V, GND connect GND, TXD connect MCU, RX RXD connect MCU; TX PPS: Connect MCU IO; Clock pulse output (can non-connect)