A bright, sweet scent of summer--lush, ripe blueberries straight from down east. About Scenterpiece Easy MeltCups: New! Change scents in seconds. First, select a stylish Easy MeltCup warmer. Then choose an Easy MeltCup in your favorite fragrances. Remove lid, place cup in the warmer, flip on the switch and enjoy. And because Easy MeltCups are always cool to the touch, you can swap them out as often as you like, continuing to use each cup for a total of up to 24 hours melt time..