Acoustimass module with head unit, 2 satellite speakers, all cables and the original remote control. The Acoustimass module works in concert with the optimal small speakers to deliver the full range of home theater sound. Proprietary TrueSpace digital processing circuitry Delivers a spacious, multichannel sound experience with strong center imaging from just two visible speakers and a hideaway Acoustimass module. The 3-2-1 GS model was introduced in 2003 and included Bose “Gemstones,” which are small speakers that include two drivers pointing forward and one pointing to the side. The original 3-2-1 system was replaced by the 3-2-1 Series II in 2004, which featured two small speakers and a subwoofer, and added progressive DVD playback, a universal remote, BoseLink, and improved acoustics. Good FM RDS reception on the short antenna. Many inputs, also digital optical. Product Dimensions: Acoustimass Module: 14.5 x 8.8 x 19.1 inches ; 23.3 pounds Interface module: 1.1 x 3.3 x 2.2 inches ; 0.99 pounds Shipping dimensions: 12.88 x 19.63 x 24.25 inches ; 31.58 pounds Carefully shipped