Phaz P2 Over Ear Noise Isolating Headphone with Built in Power Bank to Charge your Phone, Powerful Crystal Clear Sound, Comfortable, Lightweight Built in HD Amplifier and Bass Boost Black Carbon Fiber Over-ear headphones constructed from carbon fiber for lightweight comfort, and a built-in power bank to boost your mobile device up to 70% Universal design is compatible with most smartphones and USB devices, has two 3.5mm jacks to allow for music sharing Acoustically tuned by JJR Acoustics experts; an integrated HD amplifier and switchable 15db bass maximize sound quality Compact folding design lets you stow headphones away easily when not in use, complete with neoprene carrying pouch and soft touch Silicone cable case Premium perforated leatherette ear cushions in your choice of stylish color