Styled in black these SoundSport Wireless In-Ear Headphones from Bose can pair with up to two devices via Bluetooth, with or without the use of NFC tap technology. They also offer proprietary StayHear+ eartips that conform to your natural ear-shape for a more secure and comfortable fit. These features render them suitable for use during the most vigorous of exercise routines. Bose's volume-optimized EQ ensures that the frequency response of these headphones stays balanced and even at any volume. With a sweat- and water-resistant construction—conforming to the IPX4 industry standard in this regard—they are engineered to survive the demands of your active life. Their lithium-ion battery is rechargeable via USB, and will provide up to six hours of continuous playing time. Furthermore, an on-board microphone and inline remote allows you to manipulate volume, skip tracks, rewind, answer/reject phone calls, and more. Included with these earbuds are a carrying case, clothing clip, USB charging cable, and a set of eartips in various sizes. They are compatible with the Bose Connect App, should you wish to manage your device pairings in such a fashion.