bluetooth 5.0 technology, for stereo sound, good bass, crystal clear and stable; with built-in Mic for handsfree phone calls. Built-in large capacity battery to ensure long time use, 10 hours play time, no need to worry about power shortage. Magnetic Design, conveniently and securely hang the earbuds around your neck when you’re not using them. Not easy to lose. Stable Neckband, flexible for easy storage and adds stability to the earbuds when playing intensive sports.