Introducing the Hydrao Smart Shower showerhead created by Start & Blue, French design team. The showerhead contains four LED lights and sensors that monitor how much water volume has passed through.

Fast Company staffer Michael Grothaus reports on this new showerhead which will glow green while you’ve used less than 10 liters of water, purple when you go over 10 liters and remains purple until you hit the 30-liter mark, when it turns orange, and red when  you know you’ve passed the 50-liter mark:

Hydrao says that right now the average American uses between 75-80 liters (19-21 gallons) of water every time they shower, which adds hundreds to utility bills (and not just water bills; you need to heat the water too, so include gas and electric) a year. 

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