GOgroove Bluetooth Lightweight Sports Headphones with Flexible Neckband - Works with Apple iPhone 6 , Samsung Galaxy S6 Edge , Sony Xperia Z4 and More Stream wireless audio from your favorite Bluetooth-enabled device, whether you're on the move or relaxing at home. Works excellent with Apple iPhone 6 , Samsung Galaxy S6 Edge , Sony Xperia Z4 & More Perfect for Running , Cycling , Hiking , Marathons , Obstacle Courses , the Gym , Yoga , Pilates and Crossfit Training Onboard controls let you pause, play and navigate through your playlist Powerful on-board microphone allows for hands-free calling during your workout TECH SPECS - Speaker power: 20mW RMS / Driver diameter: 13.5mm / Frequency response: 20Hz-20kHz / Charging time: 3 hrs / Battery runtime: 5 hrs / Weight: 1.04 oz / Neckband length: 14.5 in