The Logitech V20 Notebook Speakers offer a convenient, high-quality speaker system for laptops with rich, full sound and deep bass all in a lightweight, portable design. The USB port provides power and digital quality audio and no other cables are necessary. Convenient multimedia controls provide easy access to track forward/back, play, stop, mute, and volume buttons that work with many software applications. System THD - less than 0.05% THD Signal-to-noise ratio - less than 70dB Frequency response - 70Hz - 20 kHz Driver size - 2 inch high-excursion driver with 3 inch pressure driver System Requirements - Available USB port, Windows 98SE, ME, 2000, XP or higher, Mac OS X or higher