The ioDigital™ valve is consists of a valve and one controller. One knob on the controller will operate the temperature, and another knob to adjust the volume. The volume knob also offers Pause feature, which will allow the user to temporarily pause the shower. Both knobs have corresponding LEDs that will light up so the user has a visual reference of the temperature and pressure. The controller also has multiple presets, so favorite temperature and pressure settings can be saved by one user or multiple users. There are three different types of ioDigital™ valves: shower, roman tub, and vertical spa. All three offer an optional remote control that can be used up to 30 feet away. They also provide Thermostatic Control, Temperature Consistency, and Temperature Memory. For more information, please view our product literature in our Literature Center.