Plug into the receiver's CH3 socket, and you will be able to control the car light via the CH3 of the remote receiver.  The single-channel control version and the high-current version are simple switches, without flashing and BLN Control functions.

Two-channel version: two channels output light up at the same time -- Channel A lights on, and Channel B turns off -- Channel A turns off, and Channel B lights on -- 2 channels flashing one by one -- 2 channels flashing at the same time -- 2 Channels BLN lighting effect -- (move in circle)

Two-channel version: Max load: 5V 1A

Note: 4 Pin outlet may differ in setup from the image (2x2 rather than 4x1)