The Advent ASP20BK21 2.0 PC Speakers are a quick and easy way to upgrade of the audio of your laptop or PC. These stereo speakers feature great sound quality wrapped in a well-designed black exterior.Simply plug these speakers in the USB slot of your PC or laptop and you're good to go, there's no need to connect another power cable. You can also use them to play music from your phone or any other device using the speakers' audio cable with the 3.5mm jack.The speakers have very straightforward controls - there's a single knob on the back side to switch them on and adjust the volume.