See this at: scientificsonline.co...| Added on 11/27/07

An excellent visual tool for young children and the elderly, this faucet light changes color with the water temperature. Red lights illuminate the water stream when hot, and blue shines through the stream when cold. The red light is turned on for... See more

An excellent visual tool for young children and the elderly, this faucet light changes color with the water temperature. Red lights illuminate the water stream when hot, and blue shines through the stream when cold. The red light is turned on for temperatures of 89 degrees and above. Works on most USA faucets and includes universal adaptors for 95% coverage. Simply unscrew old aerator and screw on the Faucet Light. Fun for the kid's bathroom and adds elegance to any powder room! See less