Blue Sadie Premium Headphones with Built-in Amp

Built-in audiophile amplifier for true high-fidelity sound on any device 50mm drivers custom-tuned for a superior soundstage Sealed over-ear design for immersive isolation Racecar-inspired multi-jointed headband design keeps earcups parallel at all times for superior comfort and sound Powers on and off automatically when headphones are opened and closed. These are top of the line headphones. Open box to check contents.