The Rodann Electronics RX&TX2000A Driveway Alarm System is the perfect solution to your outdoor security and monitoring needs. The durable wireless weatherproof design is relied upon daily by homeowners, retailers, drive-thrus, warehouses, ranchers, and many other businesses and individuals across the United States. Rodann Electronics motion detectors incorporate state-of-the-art passive infrared (PIR) sensor technology. They are not affected by sunlight, car headlights, reflections, shadows, or colors. Included with this complete system are one (1) wireless weatherproof sensor and one (1) receiver. Expand the coverage of your security system with additional transmitters, receivers, and accessories (all sold separately). This unit is not compatible with the TX/RX500 or TX/RX1000(non-A), TX/RX2000(non-A) or SL-40 models.