16oz Electronic Travel Cup Warmer w/USB Charger (Silver/Red) Excalibur 16oz. Electronic Travel Cup Warmer General Features: Silver and Red color scheme (black handle) USB ready! Works with both Windows and Macintosh computers Cup holds up to 16 ounces Features rugged and insulating double-stainless-steel construction Spill-proof lid saves your shirt when you hit that inevitable bump!