Optimal streaming performance bluetooth headset uses v4.1 technology and a superior performance chip, ensuring fast data transmission from your mobile device to the headset, so you’ll never have interruptions in the music. Focus on the music fully music headphone features echo and noise elimination technology, allowing you to enjoy your favorite songs without distractions; Perfect for your active lifestyle sport headset will stay in place without slipping off, and you can even use the headset to receive phone calls hands-free; Double the possibilities our bluetooth headset can connect with two different mobile devices up to 49 feet away at once!; A truly better battery our music headphones can be used for up to 6 hours of talk or listening time or for 220 hours of standby time before you need to recharge!;