Fire alarm bell 1.Base:aluminium 2.Fire alarm bell size:5/6" optional 3.Operating voltage:dc24v 4.High alarm sound Fire alarm bell with good performance from peasway Specifications: 1. Fire alarm bell:aluminium 2. Fire alarm bell size:5/6" optional 3. Operating voltage: 24v dc±15% (no pole) 4. Operating current: 23ma (24v dc) 5. Dimensions: ø127 x 56mm 6. Sound level: >100db (24v dc).