Altec Lansing PT8051 5.1 Channel Wireless Speaker System Advanced 2.4 GHz wireless technology and custom-designed NXT Digital flat-panel drivers for five full channels of wireless surround sound TV, DVD, VCR, Cable or Satellite TV all plug into the rear panel Three digital inputs (2 optical, 1 coaxial) Three analog inputs Video output for on-screen display (OSD) used in set-up and operation.