This 12V, 2-channel remote control relay controller board features an auto-roll algorithm for added security. It makes it almost impossible to steal the code for unauthorized use. Each output relay is controlled by a separate button on the key fob controller. Each channel can be set to momentary or latching mode allowing you to customize the setup to suit your application. Operating on the robust 433MHz band, the key fob remotes work over distances up to 40m. This unit makes remote control very affordable for your next project.