Mug has UBS etched on one side, shown above. Like new condition. The Ui 3 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 3 Mug takes the hassle out of enjoying your favorite beverages. Maximize flavor and ensure a pleasurable drinking experience. Specifications: Keeps drink hot at approx. 55°C / 130°F Handcrafted fine ceramic Volume: 12 fl oz / 355 mL Fast charge cell phone & AirPods Dishwasher safe Package includes: Ui Mug with lid OHOM pad Power adapter USB Type C cable, included The system uses electromagnetic energy, eliminating the need for batteries and reducing environmental impact.