Unlike standard PC speakers that focus sound in one direction, the Logitech Z-5 speakers use omnidirectional acoustics that create a substantially wider sweet spot - an especially helpful feature if you often move your laptop around your home or office. An innovative speaker technology previously found only in expensive home-theater systems, omnidirectional acoustics on the Logitech Z-5 speakers use forward- and backward-firing drivers to transmit sound evenly in all directions. Whether you're listening to your favorite song or watching a video on YouTube, you'll enjoy rich, articulate sound and minimal distortion - from every corner of your room.Delivering pure digital audio that's easily moved with your laptop, the Z-5 omnidirectional speakers can be quickly connected to any PC or Mac via USB. There's no need for an external power adapter or batteries.