There have been discussions about this product. Maybe these will be helpful:
Try these links: http://www.halloweenforum.com/halloween-props/68771-pressure-sensitive-alarm-mat.html
http://www.halloweenforum.com/halloween-props/74939-pressure-pad-switch.html
http://www.halloweenforum.com/halloween-props/67810-harbor-freight-mat-switch.html
Try these links: http://www.halloweenforum.com/halloween-props/68771-pressure-sensitive-alarm-mat.html
http://www.halloweenforum.com/halloween-props/74939-pressure-pad-switch.html
http://www.halloweenforum.com/halloween-props/67810-harbor-freight-mat-switch.html