Power-off protection: Automatically turns off when water runs out. Rechargeable: Charges via a USB cable in 2.5 hours, for up to 8 hours of usage (USB cable included). Portable humidifier: Get a 630ml wireless air humidifier. Colour options:Choose from white or pink. LED display: Displays battery percentage so you know when to recharge. | 630ml Wireless Air Humidifier - White