Detects motion of pedestrians and vehicles when they approach your home and property. Box contains 1 sensor unit, and mounting bracket and hardware.

• To be used with the LiftMaster® Perimeter Alert (835LM)
• Detects motion up to 30 feet away with wide 120 degree coverage
• Transmits signal to base up to 1/2 mile away
• Features adjustable sensitivity control to prevent false alerts from small animals
• Durable, weatherproof design
• Connect 1 base station with up to 4 motion sensors
• Easy to install and use
• Requires four AA batteries
• 1-year warranty