... )2, LCD digital display3, sound, light, vibration alarm at the same4 DC3.6V ~ 4.5V battery ... supply voltage5, alarm point can be set (default setting: See table ... pump)6, Display: LCD display7, alarm error: ≤ ± 5% (F.S)8, Alarm mode: sound, light, vibration alarm9, ... 140gApplicable to mining, metallurgy security ring, Chemical Services and other occasions Combustible Gas Detector