When you are directly underneath the shower head, wetting your hair or rinsing off soap, Eva sets your water flow to 100%. Providing you with a strong water flow right when you need it.
When you step away from the shower, shampooing your hair or scrubbing your body, Eva reduces the water flow; still keeping you nice and warm.
When you are further away from the shower, shaving your legs or anything else outside the flow of water, Eva reduces the water even more. Simple and automatic.