Insulation Material USB Cup Warmer Easy installation, no driver required, plug & play With On/Off switch, with DC port Insulation Material USB Cup WarmerProduct description1) Keep coffee/tea/drink warm at 50-60°C2) Easy installation, no driver required, plug & play3) USB powered,no external power needs;4) Red LED indication when warmer is turned on.5) Insulation material around the metal hot ...