-Keep coffee/tea/drink to warm at 50-60 C degree
-Easy installation, no driver required, plug & play
-Rated power: 2.5W-5V DC
-Red LED indication when warmer is turned on.
-Quality insulation material around the metal hot plate prevents burns.
-USB powered, no batteries needed

- There are new USB cup pad in last picture ,the cup pad have they can keep coffee to cold at 8-10C  degree.Second, they can keep coffee to warm at 50-60 C degree