Product Features: Invigoration tandem steam generator control unit Covered under Kohler's 5 year limited warranty Control panel is easily adjusts temperature with a range of 90-125 degrees and steam session duration Safety shut off after 20 minutes Temperature sensors help prevent temperature fluctuations Required for use with Kohler 18 kW - 30 kW Invigoration steam generators Steam head includes integral aromatherapy for adding scents Digital clock Product Technologies: Fast-Response: Produces a luxurious steam showering 60 seconds Power Clean: One-touch automatic cleaning and safe maintenance Interface Specifications: Control Face Height: 4" (measured from top to bottom) Control Face Width: 3-1/4" (measured from left to right) Steam Head Specifications: Steam Head Diameter: 3" Steam Head Connection Size: 1/2" NPT Variations: K-5549-K1: DTV+ version