... . 3.On/off switch 4.Many colors for option USB Cup Warmer And Cooler1.Keeps coffee/tea/drink warm at ... office used to warm and cool your drink.3. Use USB power, no batteries needed4.Easy installation, no driver required, ... garden items, clocks, car accessories, camping accessories, mobile phone accessories, computer accessories and peripherals.Our key features: Innovation, Multifunction, High Quality ...