Solis<REG/> 8111, For floor mounted or wall hung top spud closets, Top spud: 1-1/2", PERMEX<TRADEM/> synthetic rubber diaphragm with dual filtered fixed bypass, IPS supply is 1", Metal oscillating non hold open handle, Free spinning vandal resistant stop cap, Sensor is 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, State-of-the-art photovoltaic technology delivers solar operation, batteries provide back-up energy, Operates by means of an infrared sensor with multiple-focused, lobular sensing fields for high and low target detection