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Colour: White Alarm Diameter: 29mm / 1.14? Alarm Height: 15mm / 0.59? 2 Mounting Holes Distance: 40mm / 1.57? 2 Wires length: 105mm / 4.13? Rated Voltage: 12V Operating Voltage: 3-24V Rated Current(MAX): 20mA Min Sound Output at 10 cm: 95 DB Resonant Frequency: 3100±500 Operating Temperature: -20~80?