Kali Audio HP-1 Features: Neutral-response closed-back headphones for music production, mixing, gaming, content creation, hi-fi playback, and more 40mm driver units supply clean and balanced sound for utmost sonic authenticity Onboard active noise cancellation keeps you locked into your sound with little to no ambient interference 3 built-in tuning modes (Studio, Consumer, and Bass-Heavy) provide the perfect output for any listening application Easy-to-use playback controls for immediate author