Continuous Sound Electronic Active Buzzer SFM-27 DC 3V-24V is the best buzzer for continuous operation at any DC voltage from 3V to 24V. They have good functions like continuous beep, small cubage, low wastage and high voice pressure.

Features:

Continuous beep
Small cubage
Low wastage
High voice pressure
Specifications:
Sound-making Type: Continuous Sound
Model: SFM-27
Operating Voltage: 3-24V
Rated Current (Max): 20mA
Operating Temperature: -20 to +80 (Degrees Celsius)
Color: White
Body Size: 30 x 15mm (D*T)
Cable Length: 10cm
External Material: Plastic
Weight:16g