Gear Head SP1500USB innovative design utilizes a total of 3 watts RMS for a full range frequency response to deliver the highs and lows you expect from our computer speakers. Includes USB power cable. Magnetically Shielded: Magnetically shielded speakers ensure that other electronic devices within range of your desktop will not be interfered with, eliminating the distortion and damage they can cause. Convenient Volume Control: Our convenient volume control knob allows you to control the volume right from you desktop on the back of the satellite speaker. USB Powered: Our Plug-n-Play USB Speakers are ready right out of the box. Simply plug into an available USB port, connect the 3.5mm connector and you are ready to enjoy quality sound that will inspire you to work longer and play harder.