Home Gallery HK Cute Whale-shape Portable Cool Air Humidifier with USB Cable for Office Home Travel (White) Easy to use. Plug in the cable, turn the switch. Perfect for office. No noise when it working. Max water capacity. Depend the cup you choosed. DC:5V. Any usb plug excape very little current flow. Package included: 1 x USB Humidifier, 2 x Water absorbent sponge stick. 1 x Cotton stick cover.(not include cup)