This device has both a heating element and a thermostat. It warms up the roll-on cartridge then keeps the wax at an optimal temperature for application. The Roll-on Heater Applicator is the perfect companion to our roll-ons. Heats roll-on cartridge in 20-30 minutes. Maintains wax temperature for 30-40 minutes (if needed for longer, the device should be plugged for further warming for 5-10 minutes). Allows easy manipulation and application – no cables while you are waxing. Can be used on roll-on heater bases and wax systems.