Wireless Pedestrian and Vehicle Alert with VoiceAlerts you when a pedestrian or vehicle is detected and allows you to speak with them. Box contains 1 sensor unit, 1 base receiver, and mounting bracket and hardware.Detects motion up to 30 feet away with wide 120 degree coverageTransmits signal to base up to 1,000 feet away; detection indicators with light and soundSpeak directly to pedestrians and vehiclesMotion sensor features adjustable sensitivity control to prevent false alerts from small animalsPortable and lightweight for use inside or out