The Ui Mug is a revolutionary self-heating mug system that maintains your coffee & tea at the perfect drinking temperature. Not only this, its charging pad can also wirelessly charge your cell phone. Simple, elegant, and convenient, the Ui Mug takes the hassle out of enjoying your favorite beverages. Maximize flavor and ensure a pleasurable drinking experience. Keeps your drink hot & flavorful at 130°F / 55°C Features: LID NOT INCLUDED Keep your hot beverages at a steady 130°F when the mug is on the coaster. Bone ceramic mug holds 12 fl. oz. Includes heat-retaining ceramic lid when you need to take the mug away from the coaster. Coaster powered by USB port and included standard plug-in power adapter. (Needs to be plugged in while in use.)  The coaster is spill-resistant so no need to worry about any spills. Coaster doubles as a wireless charger for Qi-enabled smartphones.  Charger is made from anodized aluminum alloy & tempered glass. Turns off automatically if you don’t pick up the mug for an hour. Mug with lid measures 4.25h x 4"diam.; charger measures 0.3h x 4"diam.  Mug is dishwasher-safe.