If you have a security/home automation set up in your home, you can easily add wireless RF control to almost any devices. The 2-Button, 3-Channel Slimline RF Transmitter sends signals to a receiver up to 500 feet away. The 2-Channel RF Receiver (sold separately) can unlock secure doors, control house lights or garage doors, and/or signal your alarm panel. A belt clip and car visor clip are included. The 2-Button, 3-Channel Slimline RF Transmitter and receiver system is extremely secure, with over 68 billion possible fixed codes. Use the patented CODEBUMP™ technology for maximum security: In this mode, the code changes every time one of the transmitter buttons is pressed. Set up multiple RF control devices in your home: A 1-Button, 1-Channel Slimline RF Transmitter and a 4-Button, 15-Channel Slimline RF Transmitter and corresponding receivers are also available.