USB Hub & Coffee Warmer） Voltage: 5V DC,500MA . USB wire: 1.5M . Conduct time：120S . Temperature: 170℃-55℃ Description: usb cup warmer can keep warm at 40-60 degree. With V1.1 or V2.0 4 port hub, useful newest designed product! With 1.5M clear USB cable. Also with +5V DC port, can use other power supply of 5V. Product size: 10.3x9.2x2.2 cm Features: 1) Keeps coffee, tea or drink warm at 40 - 60癈 2) Suitable for all cups 3) On/off switch and LED indicator 4) No risk of burn, with enclosure made of quality insulation material, safe and easy to use 5) Easy installation, no driver required 6) Plug-and-play 7) USB hub and coffee warmer 8) Unit dimensions: 103 x 93 x 23mm Inner packing: Gift box Outer packing: 100 sets/ctn Carton dimensions: 38 x 32 x 55cm G.W.: 16.8kg