Portable: Lightweight yet rugged with a convenient folding design, these DJ-style over-ear headphones are extremely durable and portable. 40mm Driver Unit Technology: Thanks to neodymium magnets and 40mm driver unit technology, these headphones offer high-quality sound reproduction. Wide Frequency Response: Whether you're the performer or the engineer, a wide frequency response of 10Hz to 20 kHz means that you'll enjoy crystal clear highs, present mids, and extended lows. Closed-Ear Design: Sony MDR-7506 features a closed-ear design that offers great isolation. The padded ear cups and a generously padded headband makes the headphones comfortable to wear even during prolonged use. Bundle Includes: Sony MDR7506 Folding Professional Closed Ear Headphones, Compact 4-Channel Stereo Headphone Amplifier with DC 12V Power Adapter, Hard Shell Headphone Case (Medium), and 1/8-Inch to 1/4-Inch Stereo AUX Adapter (5-Pack).