The double-wall stainless steel construction along with the copper inner wall, keep your drinks warm or cold for 12h and cold for 48h. 
.: Screw-on lid with a built-in bluetooth speaker
.: Bluetooth range of 10 meters (33 feet)
.: Double-wall stainless steel construction
.: IPX6 Water Resistant
.: 22oz (0.65 l)
.: BPA free