The Logitech Z313 Replacement Satellite Speakers are a set of black plastic speakers designed for a 2.1 channel system. They come WITHOUT a subwoofer and are compatible with universal brands and models. The speakers have wired connectivity with audio jack inputs and feature a volume control, headphone jack, and are AC-powered. Perfect for enhancing your audio experience with a surround sound format, these Logitech speakers offer a convenient and reliable upgrade for your computer or desktop setup. Speakers have been tested and work as intended. Thank you for looking.