Stainless steel tumbler with removable Bluetooth speaker. Show your support for your favorite lab tech while enjoying a delicious hot or cold beverage. These tumblers are double-walled to keep beverages cold or warm for hours, and made of high quality 304 stainless steel. I do not use epoxy on my mugs or tumblers. The images are heat and pressure transferred into the surface itself. It will not crack, peel, or fade if left in a hot car or frozen ski bag. Each tumbler comes with dust-proof slide lid, plastic straw, Bluetooth wireless speaker that screws onto the bottom, USB charger cord. Choose from one of five speaker colors (pink, white, black, gray or teal).