sensing water faucet 1Unlimited time 2Do not need any ACor battery 3Work life more than 10 years Function and Characteristics of Self-powered Automatic Sensing Water Faucet HB-M9990 1. Water come out healthful: Water come out once our hand in the exact range, and stop once our hand away. Not need to touch faucet, which avoid bacterial infection. 2. Power: Do not need any outer connection power or ...