NEO-7M GPS Satellite Positioning ModuleWiring Instructions:VCC: Power supply (3.3-5V)GND: GroundTXD: module serial port transmission pin (TTL level, can not be directly connected to RS232 level), can be connected to the RXD of the microcontrollerRXD: module serial port receiving pin (TTL level, can not be directly connected to RS232 level), can be connected to the TXD of the single chip microcomputerPPX: clock pulse output angleWe highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.Package Included:1* NEO-7M GPS Satellite Positioning Module