The 3-channel radio receiver for direct connection to the 230V mains is ideal for all surface-mounted installations in both private and industrial settings. Under optimal conditions, the handheld transmitter can achieve ranges of up to 1000 meters in open fields. The 3 changeover contacts are switchable for push-button, wipe, or toggle operation. Separate learning of the transmitter code and button for each relay also allows for the assignment of key combinations, such as for alarm systems. In conjunction with the transmitter coding via DIP switches, an unlimited number of transmitters can remotely control one and/or multiple receivers.