Sloan EBF-85-4-BDM Bathroom Faucet, Optima Plus Battery Powered, Fiber Optic Automatic w/Trim Plate and Mechanical Mixing Valve - Chrome Fiber optic technology provides self-adaptive sensing for accurate water flow Splash-proof circuit control module and Isolated Latching Solenoid Operator protect components from water contact Audible tone indicates when batteries need to be replaced or faucet requires other service Vandal-resistant spray head with pressure-compensating flow control Water-efficient flow rate of 0.5 gpm/1.9 Lpm is standard Fiber Optic, Automatic, Self-adaptive Sensing Bak-Chek Tee for Hot/Cold Supply 4" Trim Plate