Overview: Keep milk, coffee, tea etc warm.4 USB (Universal Serial Bus) 1.1/2.0 high speed ports, each can support 200m A current. Digital calendar, display time, week & cup pad temperature. Auto changing to display time & week ever 30 seconds. Maintain constant temperature more than 50 degree. Warming plate for ceramic, glass & metal cups/mugs Power: USB (Universal Serial Bus) port of computer Systems: Windows 98SE / Me / 2000 / XP / Vista Power Source: Computer USB (Universal Serial Bus) for warming plate & hub, button battery for clock Specification: Weight Approx:189.1g Size Approx:14.4 x 14.4 x 6.9