Driveway Alarm w/ Lifetime Warranty. Professional Grade Wireless Outdoor Motion Sensor & Detector Alert System LIFETIME WARRANTY and AWESOME Seattle based tech support. SUPER EASY installation. Quick Start Guide has you operational in minutes! LOUD adjustable volume control. Over 30 ring tones to choose from. Set includes one sensor/one receiver. Extra sensors and receivers can be added for COMPLETE COVERAGE of your gate, driveway, home, office, pool, or property. LONG RANGE up to 500 ft from sensor to receiver (extra interference like trees, hills, walls, parked vehicles will diminish range)