fire alarm bell,warning bell,alarm button available: AC: 12V/24V/110V/220V380V, DC: 12V/24V/48V, 150MM, 200MM, 250MM fire alarm bell,warning bell,alarm buttonALARM FIRE BELL: SURFACE MOUNTING, decibel> 86dbavailable: AC: 12V/24V/110V/220V380V, DC: 12V/24V/48V, 150MM, 200MM, 250MM