High definition speaker drive units, 2.0 Two-Channel 360 degree surround super bass and stereo sound effect. Feel the shocking bass of the music. Bluetooth 4.0 chipset, powerful audio decoding, stable Bluetooth signal transmission with operating distance of up to 10 meters ( free space ). It has superior compatibility that works with all Bluetooth enabled electronic devices such as smartphone, smart TV, notebook, MP3, etc. Super capacity battery that provides up to 12 hours of playtime and can charge your smartphones and tablets via its USB output. A built-in noise and echo-cancelling speakerphone gives you crystal clear calls with the press of a button.