ATH-ANC40BT QuietPoint Wireless In-Ear Headphones Black. The ATH-ANC40BT QuietPoint wireless in-ear headphones combine Audio-Technicaâs proprietary active noise-cancelling technology with Bluetooth® wireless technology to give you greater freedom and listening pleasure in areas of high ambient noise. The wireless headphones reduce that distracting background noise by up to 90% while the 13.5 mm drivers deliver superior sound reproduction. The Bluetooth functionality, coupled with an in-line mic and controls, lets you operate hands-free, wirelessly answering/ending calls, controlling music playback and adjusting volume on Bluetooth enabled devices.