The NX-U10 uses Yamaha’s PowerStorage™ Circuit to output as much as 20W (10W x 2) total power from a USB connection. This is twenty times what other USB speakers deliver. It also has SR-Bass (Swing Radiator Bass™) technology built in for deep, rich bass that is remarkable from a speaker of this size. The USB connection also contributes to better sound quality, because the signal is transferred digitally. Music from laptops and even desktop computers, portable MP3 players and games will all sound clear, dynamic and satisfyingly loud. Great for listening to music while working or for giving presentations from a laptop