Details

Can be used in Vibration sensing applications. 

Specification
Resonance Frequency: 4.6 Khz +/- 0.5 Khz
Resonance Impedance: 200 Ohms
Capacitance: 20nF +/- 30% at 1 Khz

Dimensions

• Piezo Plate Diameter: 27 mm
• Piezo Element Diameter: 19.7 mm
  
• Plate material: Brass
• Element thickness: 0.54 mm
  
• Plate Thickness: 0.3 mm
  
• Diamter of plastic body: 30 mm
• Wire Length: 70 mm

Many Applications

Searching Piezo Element in google images turns up many interesting applications like Vibration Sensor, Gitar pickup, Earth Quake Sesmometer.

Click here to view result of Google Images

Note: After you receive this product, you need to solder wires to elements like shown below and put the element into plastic cap if your application is buzzer and needs to get sound out of element. If your application is vibration sensing then plastic cap is not required.

Interested Project: Harvesting Energy through Walking