Skylink is the first company to incorporate rolling-code technology into a home/business security system, which means that the SC-1000 provides maximum security while virtually eliminating the number of false alarms. A rolling code (or hopping code) is often used in entry systems that don't require a key, because it prevents an eavesdropper from capturing and using your personal security code. Thanks to rolling-code technology, the SC-1000's control panel will recognize radio waves only from its remote sensors (door/window sensor, motion sensor, and keychain transmitter), thereby preventing high-tech thieves from duplicating signals and tampering with your system.