Denon AH-D310 Headphones (Black) (Discontinued by Manufacturer) Acoustic Optimizer balances sound pressure in front of and behind the diaphragm Large 42mm driver diaphragms deliver dynamic and detailed sound High efficiency design extends portable player battery life while delivering high output Lightweight with newly designed headband and ear cushions for extreme comfort Gold-plated 3.5mm mini plug with -inch adapter and extension cable included