Noise Cancelling Headphones 700. In 2019, Bose released the Noise Cancelling Headphones 700, also known as the NCH 700, a new high-end product positioned above the QC 35. The headphones feature a more contemporary design with a stainless steel band and are controlled using a mix of buttons and touch-sensitive areas on the cups.
Bose started supplying American Airlines with noise-cancelling headphones in 1999 and started offering the "Quiet Comfort" line for the general consumer in 2000. Noise cancelling is particularly effective against aircraft engine noise. In these cases, the headphones are about the same size as normal headphones.
An audiophile is a person who is enthusiastic about high-fidelity sound reproduction. An audiophile seeks to reproduce the sound of a piece of recorded music or a live musical performance, typically inside closed headphones, In-ear monitors, open headphones in a quiet listening space, or a room with good acoustics.
Apple Inc. has produced and sold headphones since 2001, available for standalone purchase and bundled with iPhone (until 2020) and iPod (until 2022) products. Apple's current product line consists of EarPods (wired earbuds available with a 3.5mm headphone or Lightning connector), AirPods and AirPods Pro (wireless Bluetooth earbuds), and AirPods Max (wireless Bluetooth over-ear headphones).
Koss Corporation is an American company that designs and manufactures headphones. Headquartered in Milwaukee , Wisconsin , since 1958, the company invented the first high fidelity stereophones. 
Skullcandy Inc. is an American company based in Park City, Utah, that markets headphones, earphones, hands-free devices, audio backpacks, MP3 players, and other products.  Contents
Sennheiser electronic GmbH & Co. KG (/ ˈ z ɛ n h aɪ z ər /, German pronunciation: [zɛnˈhaɪ̯zɐ]) is a German privately held audio company specializing in the design and production of a wide range of high fidelity products, including microphones, headphones, telephone accessories and aviation headsets for personal, professional and business applications.