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Buzzer Alarm Electronic Beep Buzzer DC 12V SFB-55 Active Piezo Buzzer Continuous Sounder Electronic Buzzer Alarm Voltage range (V):12/24/220V ;Plastic Shell is made of high quality ABS material, environment protection, flame retardant, anti-aging, wear-proof, sturdy and durable to use. Sound pressure level (DB):>=110dB;resonance frequency (Hz): 3.0+0.5KHZ Working temperature (degrees):-20 - 20 Celsius?Widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephone, timer and other electronic products as a sound device. Package Contents:1pcs Electronic Alarm Buzzer