A dry diffuser allows you to diffuse essential oils without the use of water. This is a different type of diffuser than the traditional one, in which the oils are dissolved in water.  This Dry Diffuser is also rechargeable; it takes 2-3 hours to fully charge. Battery capacity: 2000mAhAn empty 10 ml bottle is included. Can work with 5/10/15/20 ml essential oil. PLEASE NOTE: The diffuser works without water.The Dry Aromatherapy Diffuser is incredibly easy to use with its user-friendly USB-C interface, and it requires no water, which means less maintenance and less mess. Its sleek and modern design also complements any professional setting, making it a versatile and functional addition to any workplace.Experience the benefits of aromatherapy in its purest form with the Dry Aromatherapy Diffuser.