Have you ever wondered how much water you use while taking a shower? In any given bathing period, you’ll likely take time to shampoo your hair, wash off, and contemplate issues like world peace. Obviously standing in the shower to think is not such a good thing for our water bill, or the environment. So sometimes you need something to snap you back into reality, other than the hot water simply running out.

Take a gander at the Water Pebble, which will help you keep track of how much water you’re using. Once you program this little plastic pebble, a green light will indicate the beginning of your shower, yellow will let you know you’re halfway through, and red means it’s time to get out. As you use it more and more, the length between the green light and the red light will shorten by about 5-7 seconds. It will last for one million blinks, and only costs $10 should you want one.