The moment I plugged in these speakers and played a song off my computer, I was blown away by the quality of sound. The Harman Kardon Soundsticks III 2.1 Channel Multimedia Sound System Speaker System are the best speakers I have ever owned. The sub-woofer provides a deep bass that seeps into my ears so comfortably. The speakers have a crisp and clean sound without any static. I am also in love with the design. Such a simplistic and beautiful design that will look good on any desk. The rubber ring on the bottom prevents the speakers from sliding around. The only problem I have with this speaker system is the design of the sub-woofer. While gorgeous, the hole on top is not very practical as it is easy to get dust and other particles trapped inside. Cleaning it would require taking the sub-woofer apart. Overall this speaker system is truly amazing and worth every penny. Battery Life Does not use a battery.