Scentball Plug-In Diffuser includes 5 refill pads. * Add 6-10 drops of essential oil/ fragrance oil to the provided pad and insert into the wall outlet. * The oil pad can be reused until it begins to discolor. * If stronger aroma is desired or to refresh, add more drops to pad. * Edens Garden collection includes the following 128 oils- Adoration blend, Allspice, Angelica Root, Anise Star, Aphrodisiac blend, Balance blend, Basil, Bay, Bergamot, Birch, Black Pepper, Blood Orange, Breathe Easy blend, Cajeput, Calming blend, Camphor, Cananga, Caraway, Cardamom, Carrot, Cassia, Cedarwood, Chamomile (German), Chamomile (Roman), Cinnamon Bark, Cinnamon Leaf, Citronella, Clary Sage, Cleaning blend, Clementine, Clove, Cocoa Absolute, Cognac, Copaiba, Coriander, Cumin, Cypress, Cypriol, Davana, Dill Weed, Elemi, Eucalyptus, Fennel, Fir Needle, Four Thieves blend, Frankincense, French Lavender, Galbanum, Geranium, Ginger, Grapefruit, Harmony blend, Helichrysum, Hope blend, Ho Wood, Hydacheim, Hyssop, Invigorate blend, Jasmine Absolute, Joy blend, Juniper Berry, Kanuka, Key Lime, Lavender, Lemon, Lemon Eucalyptus, Lemon Myrtle, Lemongrass, Lime, Litsea, Love blend, Mace, Mandarin, Meditation blend, Melissa, Myrrh, Myrtle, Neroli, Nerolina, Niaouli, Nutmeg, Oregano, Origanum, Palmarosa, Palo Santo, Parsley, Patchouli, Peace blend, Penny Royal, Peppermint, Peru Balsam, Petitgrain, Pimento, Pine, Purification blend, Ravensara, Relaxation blend, Renew blend, Rose Absolute (Bulgarian), Rose Absolute (Moroccan), Rose Geranium, Rosemary, Rosewood, Sage, Sandalwood (Australian), Sandalwood (East Indian), Sensation blend, Spearmint, Spikenard, Spruce, Stay Alert blend, Stress Relief blend, Sweet Marjoram, Sweet Orange, Tagates, Tangerine, Tansy, Tarragon, Tea Tree, Thyme, Turmeric, Valerian, Vanilla, Verbena, Vetiver, Wintergreen, Yarrow and Ylang Ylang.