CB series fire alarm bell / Electric bell (1) AC12V, 24V,110V, 220V, ... -12inch KCB series fire alarm bell / Electric bellFeature:(1) Voltage: AC 12V, 24V,110V, 220V, 380V DC 12V, 24V, 48V(2) Specification ... : Model No. Diameter(mm)Alarm sound weight KCB- ... OEM, welcome your kind enqiury. CB series fire alarm bell / Electric bell