Rozin Gold Polished Waterfall Widespread Bathroom Basin Faucet with LED Light Deck Mounted 3 Holes,Fit for 8-inch Centre(the left to the right) holes at least Cold and hot water mixing,controlled with two knobs Spout Width:8cm(3.1);Diameter of each Knob Base:5cm(1.96") LED works by water flow,No battery is needed Rozin provides any replacement in future use,so contact unhesitatingly once you have any problem