Dual dome combo holder holds two heater or lights, or a combination of heater and light. These can be used to combine a heater with UV light; with the light on a timer to simulate day light hours, and the heater on a thermostat the maintain the temperature. Max rating per ceramic holder is 150W. Each holder has its own cable and on/off switch, 1.8m long. A spiral cable tidy is also included. A hook allows you to suspend the dome over a vivarium. Top of the dome has cooling vents. Size is 285mm x 150mm.