Cons: Doesn't directly detect liquid temperature ... They may be powered via USB cables or regular power cables. The mugs included with mug warmers don't have any built-in heating functions ...

580,000 Glass Coffee Mugs Recalled Because They Can Break When Filled With Hot Liquid NEW YORK (AP) — Some 580,000 glass coffee mugs are being recalled across the U.S. after dozens of burn and ...

This image provided by the U.S. Consumer Product Safety Commission shows a glass coffee mug being recalled across the U.S. after dozens of burn and laceration injuries were reported by consumers.