PKM22EPPH4007-B0 with Buzzers Transducer, Externally Driven Piezo 1.5 V 4kHz 85dB @ 1.5V, 10cm Through Hole PC Pins is an electronic component manufactured by Murata. It is a type of transducer, which is a device that converts physical energy to electrical signals. The PKM22EPPH4007-B0 includes a buzzer and a piezo element which is externally driven by a 1.5V power supply. Operating at 4kHz, the piezo produces a sound pressure level of 85dB @ 1.5V and is attached to an insulated 10cm long, through-hole PC pin. The device is suitable for use in applications such as audio-visual equipment, toys, medical devices, and for audio signal output for a variety of applications.