A broken CD or DVD or other type of optical disc is a serious problem and one that will likely lead to loss of information stored on this media. A broken optical disc refers to a disc that has split into two or more pieces or perhaps a disc simply missing one piece.
A motion detector is a device that detects moving objects, particularly people. A motion detector is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
Motion detectors will alert you when someone comes into range. Other alarms will warn you when someone attempts to enter through a door or window. Barking Dog Alarm. This advanced alarm system uses radar technology to detect motion through doors, walls, or windows up to 4 thick. When an intruder approaches your door, it begins to bark like a large German Shepherd. If the motion continues, the barking becomes more frequent and more threatening.