1) Muffs L comes with the latest Bluetooth V4.1 and powered by high intensity drivers which deliver strikingly realistic audio experience with enhanced bass response. 2) The Aux Cable allows you to use it with non-Bluetooth devices like TV, laptop or PCs and even helps from draining your phone battery. 3) Convenient buttons to control functions like audio and call control make it easy to glide between songs and answer / reject / finish phone calls.