The Anker Advantage: Join the 10 million+ powered by our leading technology. Superior Sound Quality: Experience your music in full-bodied stereo realized through dual high-performance drivers and a unique spiral bass port (patented). Less than 1% total harmonic distortion ensures enhanced clarity and fidelity. Incredible Battery Life: 24-hour / 500-song playtime powered by a built-in high capacity Li-ion battery and Anker's industry-leading power management technology. Bluetooth 4.0 Technology: Compatible with all Bluetooth-enabled devices. Instantly connect to your smartphone or tablet from up to 15m away. SoundCore reconnects automatically to the last device used. Built-in mic for hands-free calls. What's in the box ANKER Soundcore Bluetooth Speaker with 24-Hour Playtime, Built-In Mic, Supe