Rear Seat Expansion Kit with Helmet Kits or Headsets Select Your Intercom:Offroad Mono Available in three powerful models Available in three powerful models – GMRS G4 and G1 or VHF Business Band M1 – these radios keep you in touch for miles with unmatched clarity and reliability Honda Perimeter Crossbar Seat Back Available in headset and helmet kit options for STX Stereo and Mono Intercoms with 16' cables to reach the back seats AlphaBass Headset Features:• TRUE Carbon fiber in AlphaBass models • Leather ear seals• Flex Boom Mic• M101 Red dynamic noise cancelling mic• Easy to use volume and bass controlUltimate Mono and STX Headset Features:• Carbon Fiber style finish• Flex boom mic• M101 red dynamic noise cancelling mic• Hard wired cabling• Large comfortable gel ear seals• Cloth ear covers• Easy to use volume controlMono and STX Helmet Kit Features:• Alpha Audio speakers • Superior highs and lows for quality sound• Clear Hear speakers• Dynamic Noise Canceling mic• Easy to install Helmet speakers with peal and stick adhesiveIncludes:• (2) Headsets or Helmet Kits• (2) 16' intercom CablesCompatibility:STX: Works with STX STEREO High Fidelity Intercom