Portable Sound Systems are what Anchor Audio is known for. We offered the first and we offer the best, especially when it comes to value. The Beacon, Liberty Platinum, and Explorer Pro are all AC/DC (battery-operated), and the Explorer and Liberty also come in AC-only (wired) models. The Beacon and Liberty include an option for a built-in MP3 player or CD player, a USB port to charge your iPod or MP3 player, and up to 2 built-in UHF wireless receivers. The Explorer Pro is a smaller, more lightweight version of the Liberty, the first portable sound system.