Innovative, no false alarm microprocessor technology. Easy, one touch test. Designed for the RV environment, with the lowest current draw on the market 46mA. Operates on 12V supply. Detects LP gas/propane operational range 7-16V. Brown. UL/CSA listed. 3 year warranty. Flush mount: 4 4/5"W x 3 1/2"H x 1 1/2"D.