4 Channel Wireless RF Remote Control Transmitter Receiver Module. Note: There are four buttons on the remote control, and respectively correspond to the four data bits to the receiving board output pin D0, D1, D2, and D3. Press the buttons transmit signals, the corresponding data bit is output high. Specification: Remote control:Operating voltage: DC 12V(27A / 12V battery x 1); Operating current: 10mA at 12V; Radiated power: 10mW at 12V; Transmission distance: 50m - 100m (open field, the receiver sensitivity of -100dbm) Transmitting frequency: 315MHZ; Modulation mode: ASK (Amplitude Modulation); Encoder types: fixed code Decoding receiver board:Operating voltage: DC 5V; Receiver sensitivity is -98dB; Leg 7 bits: VT, D3, D2, D1, D0, +5V and GND; VT is a valid signal high output pin upon receiving a valid signal, the pin output high, may also drive the relay;Size: 6.6 x 22 x 41mm Package included: 1 Remote control ,1 Decoding receiver board