The Microclimate B1 Thermostat is a dimming thermostat that regulates heat for reptiles. The Microclimate BI is one of the most popular thermostats in the range that regulates power output and dims the power source rather than turning it on and off. This method of temperature regulation allows you to use the B1 thermostat with incandescent globes as the dimming prolongs the life of these globes. Featuring a night time drop facility the Microclimate B1 Thermostat allows the thermostat to provide different temperatures to the reptile vivarium during the hours of darkness. This will provide a more natural environment to your reptile. The Microclimate B1 Thermostat is fully wired and ready to use.