Gas detector, 12V DC, warns of leaks of methane (town/natural gas), propane or butane at two concentration thresholds. With loud 85 dB(A) warning tone and visual control displays. Changeover relay contact 230V AC / max. 5A. Power supply: 12V DC, 150mA. Dimensions: 73 x 100 x 39mm. Suitable accessories: plug-in power supply NG1000, DIN rail power supply NGH12/1200, siren AS05, flash light BL02.