With a solid construction and sweatproof design， the Bluedio M3 Sweatproof Sports Bluetooth 4.1 Stereo Headset is a great choice for active runners and outdoor enthusiasts. It uses Bluetooth V4.1 connection to stream audio from smartphone. Double-layer alloy speakers deliver HiFi grade high performance sounds. Meanwhile， inbuilt microphone made with acoustic noise canceling technique is sensitive enough to pick up voice clearly. Moreover， ergonomically designed earplugs allow you to wear it for a long time without feeling painful. Don’t hesitate to get one!                                    Features            Solid construction， sweatproof designPerfect for active runners and outdoor enthusiastsUse Bluetooth V4.1 connection to stream audio from smartphoneDouble-layer alloy speakers deliver HiFi grade high performance soundsSensitive microphone made with acoustic noise canceling techniqueErgonomically designed earplugs ensure maximum comfortFully compatible with 4G cellphonesInbuilt with voice reminder in four languagesBuilt-in battery for about 7 hours of music or talking time                                                            Specifications            Bluetooth Version    Bluetooth V4.1    <br>Frequency Range    2.4GHz-2.48GHz    <br>Transmission Distance    10m    <br>Music Time / Talking Time    About 7 Hours    <br>Standby Time    About 160 Hours    <br>Operating Temperature    -10 ~ 50℃    <br>Bluetooth Profile    A2DF， AVRCP， HSP， HFP    <br>Color    White    <br>Dimensions    (2.24 x 0.51 x 0.39)" / (5.7 x 1.3 x 1)cm (L x W x H)    <br>Weight    2.29oz / 65g    <br>                                                            Package Includes            1 x Headset4 x Ear-hook1 x USB Cable1 x User Manual