Audio-Technica ATH-M40x Professional Monitor Headphones (New 2014 Model) with FiiO E6 Headphone Amplifier This Kit Includes Some Of The Essential Accessories You Need To Take Full Advantage Of Your New Audio-Technica ATH-M40x Professional Studio Monitor Headphones Cutting-edge engineering and robust construction. &gt; 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils. Circumaural design contours around the ears for excellent sound isolation in loud environments. &gt; 90 swiveling earcups for easy, one-ear monitoring. Professional-grade earpad and headband material delivers more durability and comfort. Removable cable. BONUS ($30 Value) FiiO E6 Headphone Amplifier For high impedance or low sensitivity Hi-fi headphones