Atomiser palma-shell effect usb colour change timer palma atomiser uses ultrasonic waves to instantly vaporize water and essential oil in the tank, to produce a cool, dry fragrant mist. - tank capacity 400ml - led light - 7pcs - powered bu usb ( length of the cord 100cm) - auto power off when water runs out - timer 3-6h height:21.5cm, diameter 16.5cm, weight: 400g