Stable structure: made of high quality ABS material, environmental friendly, flame retardant and durable. An integrated electronic vocalizer consisting of multi-harmonic oscillator, piezoelectric buzzer chip, impedance matching unit, resonator and housing. Rated voltage: 12V; Voltage range: 3-24V; Rated current(max): 12mA Wire length: 100mm / 4inch; Diameter: 23mm / 0.9inch; 12 volt buzzer works with DC 3-24V, Sound pressure level: 87 dB. Easy to operate: connected to the rated power supply, the buzzer beeps continuously, simple and convenient to use. Application: Widely used as a buzzer for the circuit of electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic devices, telephones, timers, etc. as an audible device.