Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si 1. Press and hold the key on the receiver and the to the receiver. The blue light on the receiver flashing, get into binding mode. 2. Set the transmitter into mode (confirmed AFHDS 2A protocol). After getting into mode, the receiver light changes from flashing to slow flash. 3. Transmitter get out of mode, then the receiver blue light becomes . Indicates the signal received is successful. Failsafe settings: The receiver can normally receive the transmitter signal, push the rocker to the failsafe set, long press the receiver button, the blue light flashes quickly and then always , failsafe settings is successful. size:11*25*3mm colour:black Material:PCB Package Contents: 1 * FS2A 4CH AFHDS 2A Mini Receiver 1 * parts Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.