DENON (Denon) high resolution sound source corresponding noise canceling system employs Bluetooth headphone AH-GC20 Wireless, Noise Cancelling, Over-Ear Headphone that offer the latest Bluetooth, Advanced Audio Coding (AAC) Features Denon's proprietary active noise cancelling system that can reduce or eliminate ambient noise Dual microphones on each ear cup help deliver remarkable voice clarity when making and receiving phone calls Includes a 3.5mm-" standard headphone plug adaptor for connection to home and studio audio gear, as well as an airplane adapter plug Enjoy up to a full 20 hours of wireless listening and recharges in only 3 hours