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 to transmit signals, the corresponding data bit is output high. Product Name Wireless RF Remote Control Transmitter Receiver Chip SC2262 Keys 4 Key Remote Control Channel Numbers 4CH Powered By 1 x DC 12V 23A Battery(Not Included Here) Operating Current 10mA Resonance Mode ASK Operating Frequency 315MHZ Transmitting Diatance 120-150M Coding Type Rolling Code Remote Control Size 6 x 3.8 x 1.3cm/2.4 x 1.5 x 0.51(L*W*T) Receiver Module Size Voltage: DC5V Chip: SC2272-M4 Frequency:315-433MHZ Size:4 x 2.8 x 0.6cm/1.6 x 1.1 x 0.24(L*W*T) Materials Plastic Electronic Parts Main Color Black Green Net Weight 38g Operating voltage: DC12V (27A / 12V battery a) Working Current: 10mA / 12V Radiation power: 10mw /12V Modulation: ASK (amplitude modulation) Transmission frequency: 315MHZ (SAW frequency stabilization) Transmission distance: 50-100M (no proof, the receiver sensitivity is negative 100dbm) Encoder Type: Fixed code Working voltage DC5V Receiver sensitivity is -98db. Size: 41*22mm There are four buttons on the remote control, corresponding to the receiving board feet four data bits D0, D1, D2, D3. Press the button to transmit a signal, the corresponding data bit will output high.