Denon Exercise Freak AH-W150 In-Ear Headphones with Bluetooth 3.0 Wireless Connectivity, 5-25,000 Hz Frequency Response, Black The Denon Exercise Freak AH-W150 In-Ear Headphones (Black) feature an integrated amplifier and Bluetooth 3.0 wireless connectivity to provide heart-pounding tunes that energize your workout without getting in the way. These lightweight, sweat-proof headphones stay comfortable and secure thanks to their flexible neckband and the air-cushioned earpieces. The headphones work wirelessly, so there are no cords to snag on exercise equipment. The integrated controls and microphone let you adjust your smartphone and answer calls without interrupting your fitness routine.