DESCRIPTION ALARM BELL MBA-624C Material Gong : Steel (Red) Housing : ABS Plastic Operating Voltage 24Vdc (Polarized) Voltage Range 20 to 28Vdc Quiescent Current 0A Alarm Current ≤ 30 mA Sound Output Level 95 dB at 3m Operating Temperature 0~ +65 ̊ C Operating Humidity 0~95% RH, non-condensing Weight