Gift set includes Light-Up-Your-Logo MG369 patented insulated tumbler and IT229 wireless earbuds - essentials for working from home or the office. Tumbler logo is illuminated by pressing button at base or by shaking device. Earbud logo is illuminated while in use. 16 oz. 473 mL) double-wall insulated tumbler with ABS Plastic exterior and 304 Stainless Steel interior with Polypropylene Plastic twist-on lid. Designed for use with hot and cold beverages and is hand wash only (do not microwave or place in freezer) Tumbler Uses 2 button cell batteries (CR2032) which come assembled in tumbler, and are replaceable. Caution: Tumbler may leak if tipped or held upside-down. Tumbler: US Patent: 10,874,232 B2.