Attention 1: This warmer base can't boil the water. It has only heat preservation function (it can keep your beverage to a constant temperature of 39/50 Celsius degrees)
Attention 2: Please select the correct plug from options of listing page (Reference picture) to make sure that our product is compatible with socket of your country! Do not put the air pump into water, Normally air pump is not waterproof.

(1)Include: A Electric thermal insulation base with a USB socket plug.
(2)Size: 11x11x3cm(Heating surface area: appr.89mm); Power lead length: 1.5m (Please you can also find more measurement details in the photo)

Coffee cup warmer can be arrived to the right temperature and heats your coffee or tea at a constant temperature, up to appr. 42/50 Celsius degrees with Two working mode: (1)Use home 110V-220V/50-60hz power supply, can keep a constant temperature of appr. 50 degrees; (2)Use Computer USB Interface DC 5V Power supply, can keep a constant temperature of appr. 42 degrees)

Material: Made of high quality material, durable. One key easy and safe for both home and office use. A Best office gift!

Hi, dear. Any question please feel free to contact me firstly. I will try my best to help deal with your problems in a short time as soon as I receive your message.