Plugins air fresheners include a white plugin unit and one 35ml refill unit with reed and travel cap, ready to use. Simply unscrew to travel cap from the refill unit, put it in the white plugin unit, then plug it into a plug socket and wait for the plug to warm up to release an amazing scent into your home. Can last up to 80 days on the low setting. Scents to choose from: Absolem This scent has top notes of woodsmoke, leather, match perfectly with sweet undertones of citrus, smoky vetiver, and musk. The warm spices within become more prominent when melted. Best Friend's Brother This scent starts with powdery accord of dominant creamy musk and notes of patchouli, middle notes of soft floral nuances of violet and rose, warmed with spicy accents of clove leaf at its base.