This is a pretty cool gadget for the shower, a Temperature Sensitive LED Shower Head. Not only is it super easy to install, just twist off your existing shower head and replace with the new one. The LED lights are powered by the water so no electrical wiring or batteries needed. The LED’s change color depending on the temperature of the water.
GREEN: <=32C / 90 F * BLUE: 33-41C / 91 – 105 F * RED:42-45 C / 108 – 111 F * FLASHING RED:>46 C / 115 F
You will never hop in to a overly hot or cold shower again. The best part, the shower head only costs $11.