Superlux HD685 High Definition Headphones First time for sale! US Ship! Designed to reproduce a tight bass while also featuring a sweet and clear mid-high sound profile Maximum Input Power: 200 mW.Acoustic Design: Dynamic, circumaural, closed-back. Driver: 40 mm, neodymium Soft ear pads and headband provide comfortable fit. In-line control headphone cable with microphone, made for iDevices (smartphones and tablets) Foldable design for easy storage.