Functions and Features: Water saving: water flows out when hands, containers or other objects are in the sensing zone and shuts off when they are out of the sensing zone. saving water dramatically.(Water will automatically shuts off after continuously running for 30 seconds to prevent water wasting caused by some objects which are in the sensing zone for long hours.) Hygienic: all performs are done automatically, without any manual operation, which can prevent bacteria's inter-infection. Saving Power :4 AA alkaline batteries can last for 2 years based on 4000 cycles a month. Modern Appearance: faucet body is made from Solid Brass, inchrome, long-lasting and anti-eroded. Convenient maintenance: built-in filter deployed, for preventing the impurities from flowing to the electromagnetic valve and affecting its normal work; the filter can be easily cleaned. Warning function: For DC type, when the batteries are short of power, the indicating light keeps lighting, indicating that the batteries should be replaced by new ones in time. Suitable places: restaurants, hotels, offices, airports, medical institutions or other public places and family.