Fire alarm series(break glass type: Sha-2g) is suitable for using in the field of police, factory, marketplace, school, recreation ground, and so on. The voltage rang: 220v AC /24v DC. Max current: 5a 220v AC/ 8a 24v DC. Colour: Red. The contactor resistance: ≤ 0.1Ω Working temp: -10~+50?C. Max relative humidity: ≤ 93 ± 2% ?c