With every diffuser product you get a dropper bottle of essential oil, just have to choose the scent.
 
Available Scents:
 
Harvest--- deep tonka blend with pumpkin spice
Orchard-- blood orange, verbana, grapefruit, mango and fig
Twist—peppermint, French vanilla , sweet birch, spearmint and black currant
Vines—cypress, lotus, ozone, juniper
Camp—Thyme, pomegranate, sage, pine
Amari—amarylis, magenta
Blush—Lavender, china musk, jade