[REMARKABLE SOUND QUALITY & CALL CLARITY] This BlueTooth 4.0 headphones with mic use state-of-the-art echo elimination to make conversations sound like they're taking place face to face. Noise cancellation technology makes it easy to hear your favorite songs and the person you're speaking to. Plus, the A2DP profile provides HD sound quality</br>[SYNC WITH 2 DEVICES] Pair our earbuds with micrphone and volume control with two different devices to listen to music on one and talk on the other, to answer calls on your work and home phones or to browse 2 different music libraries</br>[CHAT & LISTEN FOR LONGER] This wireless earbuds are powered by a powerful lithium ion battery for up to 9 hours of music, 10 hours of talk time and 220 hours of standby. You can recharge fully in just 2 hours to have the earbud headset ready for use again</br>[ENGINEERED FOR COMFORT] The Bluetooth earpieces were made to provide a perfect fit! You get two different earbuds to choose from to ensure that you're comfortable no matter how long you wear them. The receiver can be rotated up to 180 degrees, and the microphone rotates across 200 degrees for a truly custom fit.</br>[EASY TO CONTROL] The intuitive design of our Bluetooth earbuds/headphone makes it easy to control the volume, start and stop the music, answer calls and move between songs. You can leave your phone or tablet safely in your bag or on your desk!</br></br>Product Description</br></br><b>Summary</b><br> This SUPVIN V4.0 Bluetooth Headset with Mic is a truly hands free Bluetooth headphones,Whether you are in office,sports, leisure, work, Running, Gymnastics, Exercise,driving...you can Free your hands without missing any calls,and enjoy high quality music. <br> The Bluetooth headset is with three different sizes of earbuds, so you can choose the right one that fits your ear better. The receiver can rotate by 180 degrees, so you can adjust to the comfortable angle. With no wires, there's nothing holding you back from completing your daily routine with this headset! <br> In terms of sound quality, our universal wireless Bluetooth is certain to impress. You'll get the benefits of full duplex sound quality, echo and noise cancellation and a highly sensitive microphone to make audio rich and true. <br> <b>Product specification: </b><br> Bluetooth version: 4.0+EDR<br> Bluetooth chip: CSR<br> Charging voltage: DC5V<br> Transmission distance: 10m(33ft) <br> Frequency response: 20 Hz-20 KHz<br> Talk time: ≥8H<br> Music time: about 7 hours（double ears）<br> Standby time: ≥240 hours<br> Charging time: about 2-3 hours<br> <br> <b>Package Includeded: </b><br> 1 x bluetooth earphone<br> 1 x portable bag<br> 1 x Micro USB Charging Cable<br> 1 x S, M, L Ear Tips<br> 1 x User Manual<br></br><br/>http://www.amazon.com/gp/product/B01MXC2KRJ