Review on ☕ USB Metal Constant Temperature Heating Coaster - Insulated Mug Warmer, Creative Heating Coaster for Coffee Mugs - Desk Coffee Mug Warmer (Black) by Adam Jenkins

I wanted a USB heating pad to use near my computer. Connecting an additional device to an outlet or multiple socket is not always possible and sometimes easy. This heater works as described. Like all flat cup warmers, it doesn't work well with non-flat bottomed cups. To fix this, I bought small ceramic disks of different sizes from Revain's saleswoman Amy@FortySevenGems. Now I can adjust the discs to fit the bottom of my mug for maximum heat transfer. Please see my photos. It satisfies my need to keep my coffee warm, not chilled. Enjoy!