The Proximity Chip Key is an accessory for the Secvest 2WAY and the Terxon SX/MX/LX. Using the Proximity Chip Key replaces entering a code. The Proximity Chip Key is a plastic key with integrated electronic memory. It is programmed directly on the system. To arm or disarm the system, simply hold it in front of the alarm control panel or in front of a Terxon SX/MX LCD control unit. You no longer need a PIN code and thus you can operate your system more conveniently.