Remote sensors can be installed in location to be monitored. Control box can be installed wherever convenient and can be used alone or as part of alarm panel. Trip relay for connection to remote or local alarm panel, fan or horn if there is a gas leak or to shut off gas valve. Power requirements are anywhere from 12V to 36V AC/DC. If supply voltage is 120V AC or 230V AC, 6-watt AC to DC or AC to AC adaptor is needed for transforming voltage down to suitable input voltage range. Cable comes standard 6', but can be customized to your application up to 50'. The recommended area for one detector is 10,000 cubic feet.