Active piezo electronic buzzer module support DC 3-24V wide voltage power supply. It is a continuous Tone. As long as it is been powered it will Beep continuously.

Sound Output: 100dB at 12V DC 30cm, Response Frequency: 3000±500Hz, these buzzers are very loud which are not used indoors, them could be used outdoors, such as traffic, factory, etc..

Rated Current: 15mA, Module Size: 30 X 15mm/1.18 X 0.59inch(D*T)