What is the definition of a motion sense light switch? A motion sense light switch is a special type of wall switch that uses motion detection technology to detect motion in a room or area and activate the light accordingly. This type of switch is most commonly used in areas that require a lot of movement or where having a traditional wall switch would be inconvenient. These light switches can detect movement from both people and pets, and they are typically activated when movement is detected in the vicinity of the switch. It is a great way to save energy and money by automatically turning the lights on and off when needed. Motion sense light switches are also a great option for those who want to add extra security to their home or business, as it will help ensure that lights come on when movement is detected in an area. Motion sense light switches are an easy and effective way to automate lights in any space, and they can provide a great level of convenience and security.