The True Bamboo water vapor diffuser is an easy to fill 150 ml diffuser powered by a 120w wall plug. It can be set to operate for 1 hour, 2 hour, intermittent, or continuous. The True Bamboo has an ultrasonic wave vibration frequency that causes a vapor to propel Josiah's Esssentiall Oils. Inside the box is the diffuser, lid and plug. Essential oils are sold separately.