Returns accepted within 3 days, only for damaged or wrong products. Return offered in the form of Cash refund or Product exchange. Buyer is responsible for the shipping fees.
This basic Piezo Element measures 27mm accross and is a great vibration sensor. Attach the round disc to the object that will be knocked on such as a door and measure the voltage across the two wires. Piezo elements can also produce sound when a voltage is applied across them. They convert between electricity and vibration in both ways; Vibration applied at the round end can be detected as a voltage across the wire leads and inversely, voltage applied across the wire leads causes the round end to vibrate.
Piezo Element Disc Diameter: 0.79" (27mm) Wire Lead Length: 1.97" (50mm)