Say goodbye to unnecessarily opening the lid to check whether there is still enough uriLOCK barrier fluid in the urinal. The high-tech lid determines for you when uriLOCK needs to be refilled. How does it work? The liquid level is determined by an integrated conductivity measurement in the lid. The measurement is activated with a magnetic rod supplied. The LED light diode signals whether there is enough uriLOCK in the urinal. Green - level is OK. Red - level is at minimum, please refill barrier fluid. Powerless operation with batteries that last up to 8 years.