The Impaq SC-W uses the sophisticated VIBER™ Accelerometer Technology, it provides a much higher level of accuracy for vibration detection compared to piezoelectric technology. VIBER™ Accelerometer Technology is highly sensitive to subsurface shock transmissions resulting from attempted forced entry, it is completely immune to airborne-based high frequency noise. The result? A shock sensing technology with unparalleled catch performance while actively discriminating against false alarm sources. Unlike piezo-based shock sensors, VIBER™ Accelerometer Technology detects in all three dimensions, increasing installation flexibility as the device can be mounted in any orientation. With 5 digital sensitivity settings, the Impaq S Series can be installed on a wide range of materials, from window frames to concrete.