D-102 UL Dome Bell Key Specifications Size: 150 mm Supply VOltage: 24 VDC Working Tolerance: 20-28 VDC Standby Current: Nil Alarm Current: 0.03 AMPS Decibel Rating at 1 meter: 103 dB Universal Application: Available in three DC Voltage range from 6V,12V and 24V AC Voltage available in 240V for use with most alarm systems