The cup cooler is a desktop cooling device (not a mini desktop ref-ridge). To use it, simply place your cold drink on the base cooling plate directly, or put it into the provided aluminum cup, add a little water inside the cup to help it achieve the maximum cooling result for your beverage. This cup cooler is designed to keep your cold drinks cool until the last drop while in a room temperature environment, which enables you to enjoy a cold drink at its best cool flavor all the time. Keep your drink cool: Keeps the temperature of your drink continuously low at between 32-44.6°F(0-7°C). Fast cooling: The temperature of the surface plate cools down to between 6.8-0.4°F (-14~ -18°C) within 1 minute after switching the CupCooler on. Compatible with cans and bottles: The cup is perfectly sized to hold cans or bottles: if you place one of these insides, they will cool even faster when you put a bit of water in the cup. Compact: small in size that fits in any desktop settings.