Sensor assembly powered by a solar cell that will harvest power from artificial indoor light either incandescent or fluorescent light and use it as the energy source. For use on High Efficiency urinals that flush with as little as a pint of water. Automatically operates by means of an infrared sensor with multiple-focused lobular sensing fields for high and low target detection. User-friendly three second flush delay and courtesy flush override button. High copper low zinc brass castings for dezincification resistance. Fixed metering bypass and no external volume adjustment to ensure water conservation.