It stays normal temperature and produces almost no heat in daytime, so it is especially suitable for places with high temperature and humidity outdoor in daytime. Photoelectric sensor switch with wide voltage range for stable characteristics(120V-277V), it fits European and American house Voltage. Help to offer lighting when its dark to save more energy. Greatly increase energy efficiency and bulb life by reducing daily operating life. And the switch can be used for more than 5,000 times. It can work with most types of outdoor light lampsEnvironmental Temperature: -13- 167 Fahrenheit degree; Perfect for photoelectric automation of lighting system.