Bluetooth Headphone, Pinachion V4.0 Neckband Sport Headphone w/ Noise Reduction and Stereo Sound Build-in HD Microphone for Cell Phones Smartphones Tablet (V-Silver) Bluetooth headphone V4.0 Neckband Sport Headphone Bluetooth headphone with Retractable Earbuds: Easy to adjust the length of the line by only pressing a button; In-ear design and neckband wearing style, comfortable and stable. HD Stereo & Noise Reduction Technology: Build-in Microphone with great sound effect collection and sound isolation, never missing any important in-call. Perfect Sport Wireless Headphone: Sweat-proof and rainproof; Lightweight; Super long standby time; Inbuilt with 220mAh Li-Po battery for up to 550 hours of standby time. Magnetic ear buds snap into place when not in use; music controls on neck strap.10 Hours of Listening/15 Hours of Talk Time. AptX compatibility delivers lifelike sound for enjoying music while features such as HD voice microphone allow for crystal-clear voice interactions.