16 Bottom or Lateral Jet Air Massage System propels pre-warmed air through jets strategically located at the touch of your electronic control button. This is a 16 Air-Jet Massage System that can augument your regular whirlpool water jet system and can bring the ultimate theraputic whirlpool massage to your own bathroom. This is installed to run with or independatly by itself. Add this to your tub for the ULTIMATE relaxation bathing experience!