The 5150 Shock Sensor is one of the most low profile sensors in the industry. Advanced piezo transducer technology powers the sensor, so no power is needed from the loop. Instead, the piezo generates its own electricity when it bends as the glass breaks. Bending of the transducer must occur for the sensor to go into alarm providing excellent false alarm immunity. Features: 10' (3m) protection on a single pane of glass Detects all glass types without sensitivity adjustment On-the-glass mounting is visible from the outside to deter potential intruders Field proven with over 3 million installations around the world For multiple pane windows, one sensor per pane of glass Direct replacement for window foil and old-style mechanical shock sensors Ideal for 24-hour loop protection.  (May not work with older panels, see installation instructions)