High voice pressure buzzer: drive method: drive circuit built in mounting holes; Practical use buzzer: the buzzer features low voltage, low power consumption and high voice pressure. - warm tip: dear buyer, due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! thank you; Piezo alarm: -24v rated voltage, 2 wired connctor, convenient for connecting. for industrial use; Low voltage buzzer: inside is a piezo plus the driver circuitry and electric components; Piezo speaker: well made of abs material, this item is and practical use

What's in the box
3 x Piezo Electric Piezoelectric Industrial