Functions:  Learning infrared command from remote control.  Automatically launches infrared command when electricity recovery after power failure. (Such as ON/OFF key command in remote control) It is easy to install and convenient to use.  Effective Distance: 10 meters (no obstacle).  Application devices: air conditioner, TV box and other infrared devices.  Application places: motor room, computer room, greenhouse, indoor culture, Indoor farm, etc.     How to Use:  1. Insert the product into  USB socket (5V/0.8A-2.4A).  2. Pull out and insert the product two times quickly, The indicator is flashing. (Learning State)  3. Remote control to aim at the module's transceiver, press the key (Such as ON/OFF key) until the light is no longer flashing, automatic preserving infrared instructions.  4. Next time, automatically launches infrared command when electricity recovery after power failure.     Package Included:  1 x Self Start Remote Control Infrared Command Learning Module