Usams US-ZB230 Smart cup - car cup/bottle holder designed for quick cooling of drinks. It will fit most thermal mugs, as well as bottles and cans with drinks. The device can cool down to 0°C. The effect is achieved in a short time. An additional function is to maintain the desired temperature for a longer time. Note: *The product must be used on a DC12V cigarette lighter; for trucks with DC24V output requires the use of a car charger with voltage transformation (not included); for home use requires a special adapter (not included). *The product has a good cooling effect on canned beverages, while the cooling effect on plastic/glass bottled beverages is slightly worse due to the low thermal conductivity of the material. Features: 1. Semiconductor cooling, fast cooling. 2. One button control, screen display temperature. 3. Strong heat dissipation system without noise