1. If the water temperature under 35 ± 2 , the LED faucet light will emit blue light. If the water temperature over 35 ± 2 , the LED faucet light will emit red light. 2. Betteries can be changed/ replaced by new one when they are used up after a continuous use of 25 hours. 3. The products have excellent function in the are of water saving. In the connection of the top, setting a water saving and filter systems.