Mini Humidifier By Smart Frog - Portable Humidifier - Travel Humidifier - Personal Humidifier - USB Humidifier C005(Blue) universal USB interface:use unlimited super mini body only 0.0006 m3 volumn,occupy little space,easy to carry saving power for you,power consumption is only 2w per hour perfect humidifer for office hours,outdoor travel,leisure reading time For your peace of mind,12 hours automatic shutdown