Eva is a “smart shower” device featuring a patent-pending sensor system that uses an advanced algorithm to reduce the amount of water usage during a shower, while maintaining an enjoyable bathing experience. Eva’s valve system also features power-saving, low-energy technology, allowing for extended battery life and ease of use. The device shuts off water flow once the desired temperature is reached. It features a unique sensor system that adjusts the water flow based off customer needs and a timer that notifies users when they are taking too long of a shower.