促销USB杯保温杯保持饮料温暖在40至50
安装方便，无需驱动程序，即插即用功能USB供电，无需电池
一个LED用于USB电源，另一个LED用于工作
带开/关开关
加热垫直径：76mm
额外的杯子设置为容易享受您的温暖的饮料/咖啡通过USB在工作时间也是一个很好的促销礼品

Promotional USB mug warmer keep drink warm at 40 to 50
Easy installation, no driver required, plug-and-play function USB powered, no batteries needed
With one LED for USB power and the other LED for working
With on/off switch
Heating pad diameter: 76mm
With additional cup as set for easy enjoy your warm drink/coffee by USB during working time also an excellent promotional gifts