Fits most standard 30oz stainless steel tumblers with a 4″ top: Yukon Outfitters® (30oz), Yeti® (14oz, 26oz and 30oz), Tervis® (30oz), Swig® (32oz), SIC® (30oz), Reduce® (40oz), Polar Camel® (30oz), Ozark Trail® (30oz), Mossy Oak® (30oz), Magellan® (14oz, 30oz and 40oz), Iron Flask ® (30oz), Hydro Flask® (32oz), Grizzly® (32oz), Buc-ee’s® (30oz), Boelter Brands® (30oz), Big Boss® (32oz), Beast® (30oz), and many more.  Also fits on ALL counter tops, work desks, coffee tables, bathroom vanities, and night stands. Use a cable and clip the NARWHAL on any cooler bag, golf bag, backpack, ski pants, etc. Take your tunes everywhere you go! Bluetooth Connectivity, IPX6 Water and Dust Resistant, Rechargeable Battery, Speaker, Stereo Sound (link 2 2 speakers together.