Hilitchi 2set IC2262/2272 4 Channel Wireless RF Remote Control Transmitter Receiver Module 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. Transmission distance :50-100M (Open field the receiver sensitivity -100dbm) Work: M4 (Jog: Hold outputs let go, let go to stop output) Package Include: Decoding receiver board x 2, Remote control x 2