Review on NG1702 - Mustard USB Cup Mug Warmer Coaster in Dark Brown Hot Cookie by David Batte

It might look cute, but if you're buying it because you need a "hot stove" to keep your coffee warm, look look elsewhere. This product feels cheap and. The heating element only acts on the center of the entire surface (not sure if you examined the bottom of the mug, but it's concave meaning the heat doesn't even touch the mug). Bottom line, it's not worth the money.