You really deserve this S09 3.0+EDR Bluetooth Stereo Headphone with Hands-free Calls Function which is featured by elegnat and fashionable appearance， excellent performanceand multifunction. It can connect all devices with Bluetooth function to play music and enable you to enjoy wonderful songs. The built-in high capacity lithium battery features long service time and standby time. With high technology and fine workmanship， it provides you with high definition， high fidelity and stereo tone quality. What is more， with built-in microphone， it supports hands-free calls， very convenient and practical! Never let this opportunity go!                                    Features             Provide you with pure and high performance tone quality<br> Sponge earmuff is soft and comfortable to wear<br> Wide head frame design conforms to ergonomics<br> Digital voice reduction technology ensures clear calls<br> With microphone， volume and content switch function<br> Retractable frame can meet your tightness easily<br> Elegant and fashionable appearance <br>                                                            Specifications            Model    S09    <br>Material    Plastic    <br>Color    Black    <br>Dimensions    (5.11 x 5.70 x 1.37) " / (13 x 14.5 x 3.5) cm (L x W x H)    <br>Weight    1.02 oz / 29 g    <br>Frequency Range    20-25000Hz    <br>Bluetooth Version    3.0 + EDR    <br>Bluetooth Working Range    ≤10m    <br>Distortion    0.01%    <br>Talk Time    up to 10hrs    <br>Music Play Time    up to 10hrs    <br>Charging Voltage    USB 5V    <br>Working temperature    -15 ℃-55 ℃    <br>Speaker Diameter    7 (Φmm)    <br>Frequency Response    10Hz-20000Hz    <br>Transmission speed    57~723kb/s    <br>Sensitivity    115 (dB)    <br>Impedance    32Ω    <br>                                                            Package Includes            1 x Bluetooth Stereo Headphone<br>1 x USB Cable<br>                                                            Extra Info             <br> <br> <br>