1. Press and hold the key on the receiver and connect the power to the receiver. The blue light on the receiver flashes, get into binding mode. 2. Set the transmitter to binding mode (confirmed after protocol 2A). When you enter binding mode, the receiver light changes from flashing to slow-flashing. 3. The transmitter exits the binding mode, then the receiver's blue light becomes bright. Failsafe settings: The receiver can receive the transmitter signal normally, move the rocker to the emergency kit, long press the receiver binding button, the blue light flashes quickly several times, then it is always bright. The failsafe settings are successful. Size: 11x25x3mm Material: PCB Color: Black Package Content: 2 x Mini Compatible Receiver 2 x Parts Only the above package content, other products are not included. Note: Light reflection and roacute; Different displays may cause the color of the item in the picture to be slightly different than it actually is. The allowed measurement error is +/- 1-3cm.