Meet Hydrao: a smart showerhead that helps you save water. Hydrao comes with LED lights, which change color as you use more water. When you pass a threshold, the Hydrao communicates with its mobile app and changes color.
The companion app will be available for iOS and Android devices. You can use it to set thresholds and track savings per shower. The current version has Bluetooth but according to the developers, a WiFi version could debut later. More information is available here.