These sensor switches are extremely flexible. They are designed for use with one or more lights up to 600 watts. With no minimum load requirement they can be used with low wattage appliances such as fluorescent lamps, alarms and video cameras. They are rain-tight and may be mounted inside or outside. The sensor has the following features: 140 detection angle, 40' range, dual zone lens with Sneak-By-Guard, adjustable aim (270 horizontal, 65 vertical), includes shrouds to customize detection zone, rain tight enclosure, UL rated IP54, adjustable time setting 10 sec to 15 min switching capacity 0 to 600 watts, no minimum load requirements, 120VAC. Also available in black. Precision-molded curved lens Unlike other thin flat lenses, the NightGUARDIAN lens is molded into a curve, so it is distortion free and water-tight. No false triggering either due to distortion or moisture problems. In fact, the entire NightGuardian unit carries a UL rain-tight rating. Unlike the competition, it does not have to be placed under an eave or in a protected area. Advanced surface-mount circuit board for greater reliability and longer life Similar to the circuit board circuitry used in personal computers, NightGuardian technology provides reliable, accurate performance from -40F to 120F. This means no false triggering due to wind, leaves and swaying branches, snow, rain and hail, barometric pressure changes or sudden temperature changes. The competition often uses 30 year-old technology, using push-through mounting of components onto the circuit board and a layer of solder to make connections between circuits. This type of circuit responds slowly and has to go through many connection points, providing many potential points of failure. Built-in surge protection with auto-reset Unlike the competition, the NightGUARDIAN resets itself instantly after power surges, outages and shortages. Additionally, if the competitions' product is miswired during installation, the circuitry is generally destroyed. With the NightGUARDIAN, the unit simply resets itself once the wiring connections are corrected. No mounting height limitation Only NightGUARDIAN can be installed at any height, even above 12 feet. With its UL rain-tight rating, NightGUARDIAN can be placed in open weather... it does not require a protected area. Flexible detection coverage NightGUARDIAN offers "Sneak-By Guard," which prevents intruders from sneaking under the lens. Minimum coverage distance of 40 feet, even farther in colder temperatures. Views a 140 horizontal angle that adjusts to cover any 140 in a 270 sweep, with a 65 vertical plane adjustment. Zone adjustments made easy with clip-on shrouds that allow split zones. Timing adjustable from 10 seconds to 15 minutes. Microprocessor manual override The competition's product will often slip into override as a result of power outages or surges, wasting electricity until you notice the unit is in override mode. With the NightGUARDIAN, the unit will automatically return to normal operation after four hours. Additionally, a red indicator light behind the lens lets you know the unit is in manual override mode, eliminating guesswork.