Convenient to keep your coffee warmer Neoprene as the material USB gadget,office gadgets USB Coffee cup warmer Features:1) To maintain coffee / tea / drinks at the temperature of 50-60 , easy to install, no need-driven, hot-swappable2) Voltage Rating: 2.5 W-5V DC, a single on / off conversion system, when the heater activated, A red LED lights instructions. 3)  Vicinity of metal heat-insulating materials of good quality to prevent burns, USB interface electricity, not batteries.4) Provide four USB1.1 interfaceColor Box Packing Info:-Product Size:12.3x9.3x2.3cm -Carton Quantity: 100pcs/Ctn-Dimension:38x31x55.5cm -N.W:15.3Kgs -G.W:16Kgs 

USB coffee warmer USB gadget promotional gift