Our White UL listed AC adaptor plugs easily into the portable heater unit for electrical heating. Your Luminous Lashes heater unit does get a tad warmer with the use of our AC Adaptor attachment and you will save in the long run on the cost of batteries. Please do not use any other AC Adaptor with your Luminous Lashes unit as they may cause a malfunction. Our AC Adaptor has been specifically designed to work with your Luminous Lashes heater unit. Your heater Unit works with batteries and/or our AC Adaptor and please do not use both together.