While enveloped in a sea of stars, enjoy your favorite aroma.Used to relieve stress and tiredness for women this is ideal for personal use but also as a gift. Add hot water up to the indicated line in the inner plate, add 1 or 2 drops of your favourite essential oil turn on the power to release your favourite aroma while showing over 10,000 stars on the ceiling. Waterproofed so it can be used in the bathroom. Uses 4 AA batteries (sold separately).