Unlock secure doors, control house lights, or open your garage door remotely using a tiny wireless transmitter that resides on your key ring! The 1-Button Wireless Transmitter sends your command up to 500 feet to the 1-Channel RF Receiver (sold separately), which relays your command to its intended device through your security/automation system. This transmitter/receiver system is extremely secure, with over 68 billion possible fixed codes. The 1-Button Wireless Transmitter is compatible with all SECO-LARM receivers, so you can set up multiple RF control devices in your home: A 2-Button, 3-Channel Slimline RF Transmitter and a 4-Button, 15-Channel Slimline RF Transmitter and corresponding receivers are also available.