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.
Brightness detectors. The sun/twilight sensor is attached to the window-pane. It measures the light intensity and if, for example, the sunlight is too strong, will lower the blinds. How far the blinds are lowered will depend on the position ...