Juysport V4.0 Bluetooth Mini Lightweight Wireless Stereo Sports Headphone (Green) Bluetooth 4.0 technology,the signal strength is nearly twice times than the general bluetooth headset in the market. can be stay in your ears comfortablely awesome portable and lightweight wireless headset It can accurately distinguish the difference between voice communication and noise, adopt the most advanced bluetooth CVC6.0 noise cancellation,and judge it intelligently through the transmission between different decible and reduce noise decibels.Which makes you enjoy a clear sound even through you are a noisy environment. No matter ther high pitch ,bass or treble accentit can presented perfectly,HD stereo with the 96KHZ DAC is more delicate than standard-definition sound,Built-in HD microphone,makes you enjoy a clear and loud sound.Play/pause (also answer calls), Vol +/-, and next/previous track buttons, super easy operation, good workmanship. Sweat-proof, durable design,built-in rechargeable Grade A polymer 85mAh battery lasts close to 4.5h talking time,5 hour music time, onscreen battery and 145 hours standby time makes you do not worry the bluetooth device out of juice in your daily life High-fidelity stereo music and clear speechoperating distance: Up to 10m (free space)