With the LumeCel™ rechargeable energy system and advanced solar panels, the AutoFoam dispenser is completely self-powered by artificial or natural indoor lighting. LumeCel's™ rechargeable energy cells are made from nickel metal hydride technology. Highly efficient, LumeCel™ stores energy from light, providing it's own internal energy source. All new LUX Detector measures the amount of light available in a washroom and indicates if there is enough light energy to be stored in the rechargeable energy cells that power the dispenser. The LUX Detector has two modes that make installation easy. Install Mode detects and confirms room lighting. Run Mode keeps your dispenser running efficiently.