REXSONN USB Misting Fan - Ultrasonic Desktop Cooling Humidifier with Built-in Battery and Water Tank for Beauty, Home, Office and Travel Not only just a desk fan but also a misting humidifier with built-in water tank. It will provide you cool moisture wind in hot summer. Built-in Reachargable Battery and One Button Open: 3 hours fan working time and 1.5 hours humidifier working time without USB charging. Safe Soft Blades and Adjustable Design: more safe when using the fan since the blades are made of environmental fiber material, and it offer 70 adjustment in up-down direction. Suitable for Home, Yoga, Office, Spa, Bedroom, Baby Room. Perfect gift idea for family and friends. Refresh the dry air and help with cracked skin from lack of humidity. We do not advice you add perfume or essential oils in the fan for the healthy reason.