FEATURES AND FUNCTIONS 1. Water saving : Water flows out when hands approach it and stops immediately when hands draw back from sensing zone; besides, water will automatically stop if there is object within the induction zone over 30 sec . 2. Hygienic : Automatically turn on/ off without touching to avoid from bacteria infectction, especially in public places. 3. Power saving : 4pcs No.5 alkaline batteries can last two years based on 100 times per day; keep working during power cut if adopt AC/ DC series products. 4. Easy maintenance : deployed with filter inside to avoid from impurities , easy clean. 5. Suitable places: The places having various type of users like hospitals , office buildings, airports.Family use is also very convenient.