Powerful portable Bluetooth speaker power 20W RMS with Aux-In, USB for device charging and second USB for playback. It is quite loud indoors and outdoors and produces clear sound at all volumes. It has a USB port for music playback and a large 6000 mAh battery that gives you up to 15 hours of playback at 50% volume. It can be connected to a music player, such as a TV or mobile phone, through...