Place these bright and easy to read decals on the glass doors or windows of your home, business or car to announce to would be intruders that your property is protected by an electronic security system. These decals are a great deterrent whether or not you actually have a alarm system. Thieves are looking for the easiest home or car to burglarize. The presence of these decals can cause them to pass by your property in search of an easier target. The decals measure 4 inches by 4 inches. Each pack comes with 4 decals that have an UV coating to prevent fading.