Bluetooth speaker with 24-hour playtime, 66-foot bluetooth range & built-in mic, dual-driver portable wireless speaker with low harmonic distortion and superior sound. 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. 24-hour / 500-song playtime powered by a built-in high capacity Li-ion battery and Anker's industry-leading power management technology. Compatible with all Bluetooth-enabled devices. Instantly connect to your smartphone or tablet from up to 66 feet away. SoundCore reconnects automatically to the last device used. Built-in mic for hands-free calls. Micro USB charging cable is included. Specifications: Bluetooth Version:4.0; Driver output: 3W×2; Playtime: Estimated 24+hrs @80% volume; Battery Capacity: 4400mAh; Input: 5V / 1A; Charging time: 5 hours; Bass Boost: Passive radiator; Handsfree function: Y; Volume/Track control: Y; Range: 20m/66ft; Weight: 365g/12.9oz; Size: 165 x 45 x 54 mm