Previously I had the "MusicMan MA speaker" who would have been enough of the sound quality. However, the duration was too short and was charged only on socket or a portable USB battery. The D100 is definitely holds what is promised in the product description, duration is just super in combination with good batteries. Sound quality is also excellent (in the price range), but he is also quite a bit larger than the "MusicMan MA Speaker". Connect with Bluetooth devices and service is generally very simple. Turning - hold Bluetooth button until it flashes and the loudspeaker is found from the smartphone.