Door Trigger switches has a built in reflective sensor that consist of a transmitting and receiving diode. Transmitting diode emits an infrared pulse which is reflected by an object approaching the sensor detection range. The receiving diode then receives the reflected infrared pulse which triggers the internal switch allowing the light to switch ON/OFF. RS.DT2 Type 2 switches for cabinets and wardrobes are available in both single and double door types at a max power of 60W for surface mounted applications.