Now you can see the status of your gas system at a glance, even in dim light. Universal symbols on the back-lit display and membrane switches show you everything you need to know, eliminating the need to read the small print found on most electronics panels. This detector is standard with one remote sensor. You can add an optional sensor, allowing you to detect leaks in 2 different locations at the same time. If there is a leak, the display flashes a warning and the audio horn pulses an alarm. After 32 seconds the gas supply automatically shuts off ­ and stays off ­ until you reset it. This unit is simple to install, comes complete with the remote sensor head and 17` cable, and is backed by a hassle-free 2 year parts & labor guarantee. Dimensions: Approx. 5" W x 4" H x 1.5" D 12 Volt DC.