Cool toys

I just found a cool toy at Bed Bath & Beyond (the store does have some cool stuff). What I found was an attachment for your sink faucet that lights up using three colored LEDs. The cool thing about it is that it requires NO BATTERIES !!! It has a miniature hydroelectric generator inside the housing that powers the LEDs. The LEDs are also connected via a temperature sensor and change color as the water gets hotter. Is that cool or what? I recorded a video below so you could see it in action

Hydroelectric Powered LEDs