This Bose Gemstone Speaker Cable is designed to connect your Cinemate 3-2-1 321 audio system and is compatible with the Cinemate 3-2-1 321 model. The cable is 12 ft long and features a 1:2 connection split/duplication, with a 9 pin jack as the connector A and an 8 pin female jack as the connector B. The cable is shielded and has a maximum output voltage of 5 V. It is classified under California Prop 65 as an Audio Speakers Connection Cable. This cable has been tested and is perfect for connecting your audio system for an enjoyable listening experience. 68