The TOPGREENER TDOS5-JM Motion Sensor Switch automatically turns lights and motors on and off according to the motion (occupancy/vacancy) detected in the room. In addition to its motion sensing capabilities, it also has built-in ambient light level sensing capabilities to control lights intelligently. Featuring CDS technology, TDOS5-JM prevents the switch from turning on when there is enough natural light in your space. It will also learn your on/off behavior. When the switch automatically turns on and the user turns it off within 15 seconds, the sensor will remember the light level the switch was turned off at and prevent it from turning on at that light level anymore. There are two modes: Occupancy (OCC) and Vacancy (VAC) modes. In occupancy mode lights are automatically turned on when you enter a room and automatically turned off after the room is vacant. This is especially convenient when entering a room with your hands full, such as an entryway, laundry room, garage, etc. Avoid fumbling in the dark for the light switch or tripping when entering a dark room. Vacancy mode is another option to choose from, which requires manually turning the light on and automatically turns the light off when the room is vacant. VAC mode is used in rooms that do not need the lights to automatically turn on, such as bedrooms and media rooms. TDOS5-JM sensor switch provides reliable performance.