Product info: built-in Bluetooth for wireless music listening and phone calls 6.5mm dynamic drivers voiced similar to Klipsch speakers uses same drivers as the popular wired R6 headphones rechargeable battery offers up to 18 hours of listening IPX4-rated water-resistant tangle-resistant cables connect to a leather-lined neckband neckband vibrates for phone call notification in-line remote and microphone for controlling music and phone calls 3 pairs of patented Klipsch oval ear tips for a comfortable, custom fit offers up to 22dB of noise attenuation includes carrying case and clothing clip frequency response: 10-19,000 Hz weight: 0.5 oz.