You’d better attach enough importance to headphone selection because a good headphone has a great impact on tone quality. This HT Upgraded Version Head-mounted Stereo Bluetooth V4.1 Sports Music Headset with Micro-SD Card may be a wonderful recommendation for you. Advanced technology guarantees the durability and high performance. What is more， with stereo audio effect， this headphone could emit clear and fair-sounding sound， which will greatly meet your need. And thank to its ergonomic design， it is quite convenient to use. You can enjoy maximum sound quality experience with this headphone!                                    Features            Bluetooth V4.1 head-mounted headset， wear comfortably and convenientlyExcellent tone quality and stable performanceHigh quality headphone for clear voice pick-upErgonomic design will bring you much comfort without any irritationSupport ISO battery display， voice control， long standby time， micro-SD card data transmission and radioPowerful bass; suitable for the game， music and talking                                                            Specifications            Color    Black    <br>Bluetooth Version    V4.1    <br>Operating Distance    Up to 10m    <br>Support Profiles    A2DP， AVRCP， HSP， HFP    <br>Impedance    16Ω    <br>Sensitivity    110dB    <br>Transducer Type    Dynamic    <br>Frequency Response    20Hz-20KHz    <br>Music Time    Up to 40 Hours    <br>Talking Time    Up to 45 Hours    <br>MP3 Playing Time    Up to 15 Hours    <br>FM Playing Time    Up to 15 Hours    <br>Stand-by Time    Up to 1625 Hours    <br>Charging Time    About 2 Hours    <br>Operating Temperature    -10℃ to 50℃    <br>Dimensions    (6.89 x 6.69 x 3.35)" / (17.5 x 17 x 8.5)cm (L x W x H)    <br>Weight    7.20oz / 204g    <br>                                                            Package Includes            1 x Bluetooth Headset1 x USB Cable1 x Audio Cable1 x User Manual