, The Anker Advantage: Join the 20 million+ powered by our leading technology.. Patented Sound Technology: Full-bodied stereo realized through dual full-range drivers and a unique patented spiral bass port. Carefully designed transducers keep total harmonic distortion below 1% for superior audio clarity that's unprecedented in this price range. , Groundbreaking Battery Life: 24-hour / 500-song playtime powered by a built-in high capacity Li-ion battery and Anker's innovative power management technology. , Bluetooth 4.0: Instantly pair to your smartphone, tablet or to any Bluetooth compatible device and start streaming lossless CD-quality sound from up to 66 feet away. SoundCore reconnects automatically to the last device used. Built-in mic lets you take hands-free calls at any time.