Plantronics BackBeat FIT Wireless Bluetooth Headphones - Waterproof Earbuds for Running and Workout, Green, Frustration Free Packaging WORKOUT HEADPHONES: Specifically constructed with a flexible design so sports earbuds remain stable in your ear throughout all levels of exercise; Case not included with running headphones. WATERPROOF AND SWEATPROOF: Designed with invisible nano-coating technology to protect sport earbuds against water and sweat during running and workouts. LONG LASTING BATTERY LIFE: Impressive 8 hours of wireless listening time per charge allows you to spend more time working out with these sports headphones. Frequency response: 50-20,000 Hz WORKOUT FUNCTIONALITY: Easily accessible on-ear controls let you control music and calls through our Bluetooth technology; use as Bluetooth headphones for running, biking, and more. SPORTS EARBUDS SAFETY: Running headphones features a safety-oriented eartip design that allows you to hear your surroundings during outdoor exercise and activities.