Recreating the natural cycle within the cage. Two temperature settings are possible: daytime and nighttime temperatures. During the day, the lights and UV lights are turned on, creating a warm daytime environment with high temperatures. At night, the lights and UV lights are turned off, creating a cool nighttime environment. By controlling the heating equipment at a slightly lower temperature, the natural cycle can be recreated within the cage. GEX Timer Thermo Used a little, so there is some dirt, but it was used cleanly.