This HBS-730 1-to-2MTK 4.0 Stereo Bluetooth Sport Headset with Microphone Hands-free Calls is extremely suitable for outdoor sports such as jogging， cycling， mountaineering， etc. Designed into 1-to-2 style， it can meet your different needs under different occasions. Adopting superb Bluetooth smart chip， this headphone ensures stable Bluetooth receiving. Besides， it is energy-saving and low power consumption for economical use. With buttons design， you can control music or voice volume easily. It support hands-free calls function with a built-in high sensitivity microphone. Never hesitate and just follow your heart!                                    Features             High-quality audio and excellent tone quality<br> With a microphone for hands-free calls function <br> Adopt ultra light head band for comfortable wear<br> Magnet absorption design for convenient use and storage<br> Smart noise reduction and echo elimination ensure clearer communication<br> Support two mobile phones or devices with Bluetooth simultaneous connection <br> Offer silent microphone communication<br> Connection and low battery voice prompt<br> Auto reconnection<br> MTK chip is stable and advanced  <br>                                                            Specifications             Speaker Diameter     0.47" / 12mm    <br> Frequency Response     2402MHz - 2480MHz    <br> Bluetooth Version     Bluetooth 4.0 + EDR    <br> Chip     MTK    <br> Transmission Distance     393.7" / 10m    <br> Charging Time     10 Hours    <br> Music Playing Time     >8 Hours    <br> Standby Time     >300 Hours    <br> USB Cable Length     17.52" / 44.5cm    <br> Battery     Battery 3.7V/ 180mAh    <br> Weight     1.09oz / 31g    <br> Color     Black    <br> Dimensions     (5.2 x 6.3 x 0.71)" / (13.2 x 16 x 1.8)cm (L x W x H)    <br> Operating Temperature     -10℃ - 60℃     <br>                                                             Package Includes            1 x Bluetooth Sports Headset<br>1 x USB Cable<br>1 x User Manual<br>4 x Ear Caps<br>