material: brass chrome plated - intelligentize: water is automatically released from the faucet when hands enter the sensor area and sensor will shut off once hands are pulled away. - hygiene: the faucet can be operated without users touching it. this can prevent cross infection. - anti-impurity: our patented hydraulic solenoid valve can prevent debris in water clogging the faucet and therefore increase the durability of our products. - electricity-saving: uses only 4aa alkaline batteries, which can last up to 18 months. - water saving: water will be shut off after discharging continuously for 30 seconds.