Unlike the Himalayan Salt Lamps we carry, this is an oil diffuser/mini-humidifier that requires water and essential oil to operate. This lamp must be seen in person to be truly appreciated. It holds 120 mL of liquid and has 3-6 hours of diffusion time, with 3 different misting settings and 7 LED color changing lights. It automatically shuts off when the liquid runs out. Approx. 5"x5"x5" w/ 6 ft 110 cord.