Description

Model / manufacturer: Not identifiable from the image.
Sensing element: Exposed ceramic piezoelectric disc bonded to a metal plate.
Sensor connection: Two-wire leads and a two-position screw terminal.
Controller connection: Three-pin header; exact pin assignments are unclear.
Construction: Blue PCB with a mounting hole and external sensing disc.
Potential applications: Knock detection, electronic percussion, and vibration-triggered controls.