LED light on if wired correctly and module works properly after 5s relay works too; Relay on / off by pressing S1 and indicator will on or off too; Relay will shift to on / off by pressing IR remote control after successfully learned and the indicator light will on or off. Remote control learning: There are two methods of operation: 1 Press and hold S1 button for 5 seconds the indicator LED1 turns on and get into the learning state; Then release the button S1 and press the remote control button the indicator flashes which means that learning has been successful. 2. The infrared receiver with the remote control at the module press any key on the remote control for 10 seconds the indicator LED 1 brighten it means entering learning state and then press the remote control button the indicator flashes which means that learning has been successful (long press LED 1 to cancel learning state or auto exit by waiting for 30 seconds); Note: The vast majority of home appliances remote control can be studied to identify not including non-38KHz remote control of air conditioning.