Wireless vibration sensors will detect the presence of vibration on a flat surface. They can be used on accessible windows as they will detect if someone bangs or tries to smash the window. If you have sliding windows you can adjust the sensitivity to detect sliding movement. The WD-80 can also be used on the outside of a safe.

Specifications:
Model..............................................WD-80
Wireless Working Frequency..........433MHz – Approved for NZ & AU
Wireless Transmission  Range........Approx. 25 metres through two walls
Size.................................................5.4cm x 10.5cm x 1.5cm
Battery Type...................................2 x AAA
Battery Life.....................................1 - 2 years
Warranty.........................................2 years