This is the PVDF piezo film used for PolyK Firefly. It is produced with high performance 110 um thick PVDF piezo film, capacitance about 1.25 nF. Active area 20 mm wide x 67 mm long. with solderable pin connectors that can be safely soldered with wires for connection to external wires or circuits.
there is a 225 um thick PET backing layer.
Output is > 100 V from simple vibration.
It can also be used as a heavy duty vibration sensor.
Made with PolyK piezo PVDF film with high d31. The 110 um thick piezo film with silver electrode is a good material for energy harvesting due to its mechanical robustness and high output voltage: http://piezopvdf.com/pvdf-piezoelectric-film-120-um-thick-silver-ink/
Other sensor size can be produced upon request.
Youtube video on firefly: http://youtu.be/50nsz4Z6U1Y
You can also make your own energy harvesting "shoe" sole by following this procedure:
This can convert your walking to electrical energy and charge your smart phone or smart water.