Choose a location
Glass break sensors should be located within 20 feet of the window or group of windows that are being monitored.
You can place them on walls or ceilings, but they should be up high and out of the way of obstruction. When placing on a wall, it should be 6.5 to 8.5 feet above the floor.
Keep in mind, because this sensor depends on sound, it should not be placed behind anything that would block the sound from reaching the device. Avoid small, humid, or noisy areas such as kitchens and garages.