Make workouts Brighter with your favorite music and wireless movement. The wi-sp500 wireless sports headphones feature a sweat-proof Design2 and open type drivers that allow natural ambient sound in for increased awareness. With a lightweight style and ergonomic rubber grips to make sure your ear-buds stay in place, your workout just got that much better. Frequency Response: 20 Hz–20,000 Hz (Sampling frequency 44.1 kHz); NFC: Yes; Volume Sensor: Yes