Rozin Brushed Nickel LED Colors Waterfall Bathroom Sink Faucet Deck Mounted 2 Handles Basin Mixer Tap Deck Mounted 3 Holes,Fit for 8-inch Centre(the left to the right) Sink at least Cold and hot water mixing,controlled with two knobs LED work by water flow,No battery is needed 1/2" standard connection,commonly used Rozin provides any replacement in future use,so contact unhesitatingly once you have any problem