Double-walled vacuum insulation design prevents heat transfering to the outer walls of the tumbler. it means the tumbler can keep your favorite drinks icy cold or piping hot for hours. so you could enjoy your beverage cold by the pool, take your cup of joe on the go. With a 17oz capacity, this Bluetooth mug has a removable wireless bluetooth speaker in the base. Includes MicroUSB charging cable and 500MAH battery capacity. Add your school, sports team, organizational or company logo or message to customize.