The Liberty Platinum unpowered companion speaker is the most popular, portable sound system on the market. This speaker is designed to provide crystal clear voice amplification, and is also great for music. There are no batteries and it must be connected to a powered speaker to run. The back panel has a line-in to be powered by a Liberty, or other Anchor sound system. Use it indoors/outdoors for schools, corporate events, sports, places of worship, and more!