NEO-7M GPS Satellite Positioning Module Wiring Instructions: VCC: Power supply (3.3-5V) GND: Ground TXD: module serial port transmission pin (TTL level, can not be directly connected to RS232 level), can be connected to the RXD of the microcontroller RXD: 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 microcomputer PPX: clock pulse output angle We 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

5.TTL level, compatible with 3.3V/5V systems.(Size:39*25.5mm). 4.With SMA interface can be directly connected to an active antenna SMA. 3.With the passive ceramic antenna and passive antenna amplifier, make better use of the individual effects. 2.With a USB interface, you can watch the computer positioning effect directly phone line. 1.Get 51 Arduino STM32 microcontroller routine.