Asidun&reg; Stereo Wireless Bluetooth V4.1 Headsets, Sports Earbuds With Mic, Earhook Headphones In-Ear (AD-022-GY) Workout headphone: studio headphones providing steady Bluetooth V4.1 signal and support stereo APT-X lossless music. Ultralight and ultra-small designed for comfortable and secure wearing. Dual high performance microphones deliver superb noise cancellation for crystal clear calls NFC for quick connection - support NFC fast pairing and voice prompt. Sweat proof - designed to withstand most intensive workout conditions.