The main parameters of the operating frequency of the receiver board: 315M Operating voltage: DC5V Working current: ≤3mA (5.0VDC) encoding chips: PT2272-M4 (non-locking / jog) Pin Description: GND VCC D3 D2 D1 D0 VT Sensitivity: better than - 105dBm (50Ω) Remote distance: 50-1000 meters (open land) receiver module of the seven pins, respectively D3, D2, D1, D0, GND, VT, VCC, where VCC is the supply side of DC5V, GND to ground, VT terminal for decoding the output valid as long as the transmitter has an output data code, VT can sync output high; D3, D2, D1, D0 is the data output of the four 2272 decoder chip, when there is a signal can be output 5V so high, drive current of about 2mA, and four data transmitter code output correspondence. Receiving module can not weld the antenna reception signal, in order to improve the receiving sensitivity, can be used a length of about 23 cm of soft wire soldered directly to the antenna hole, referring to FIG RC oscillation resistor, and the transmitter receiver module shock resistance need to match in order to work, the transmitter can use my shop fixed code four key * Quad-band coding or transmit modules, such as matching with other transmitters, you must provide the transmitter parameters.