The HD 820 delivers an unparalleled, reference-grade audiophile listening experience in a closed headphone Innovative glass reflectors and frequency absorber systems replicate the wide-open characteristics of audiophile speakers in a sealed earcup design 56mm Ring Radiator transducers and Glass Reflectors provide total immersion in your music with absolute detail and a breathtaking soundstage Made in Germany using the finest materials for sound integrity, build quality, and luxurious comfort Connectivity technology: Wired Included components: HD 820 headphones, 6.35-millimeter cable, 4.4-millimeter Pentaconn cable, owner's manual

World-Leading Digital Active Noise Cancelling (ANC): Advanced noise cancellation technology effectively quells 90% stable low-frequency background noise when in a noisy environment airplane/subway/car/office/factory/crowd etc.(not 100% sound canceling.).ANC works well in both wired and wireless modes. ANC ON, World OFF. To be better and better noise reduction is our goal! Elegant Appearance & Tiny Lightweight Folding: Light for head relaxing and portable for traveling storage. Durable headset 0.4 lb ONLY! 90°-170°ear-cups’ multi-angle flexible rotation with an adjustable headband of 8 levels’ size stretch. Ergonomic international standard size. Fast Charge&50+Hours Enjoyment: USB-C Charging 10 minutes to use 2 hours. High efficiency and energy-saving Bluetooth 5.0 to prolong playtime up to 50 hours after 1-2 hours’ full charge.Built-in sensitive microphones