With PIR sensor (person infrared sensor, infrared human body detection sensor) which could detect the infrared from the people in front and send sound signal to speaker through audio output. This feature is not available to other analog camera.
Plus an alarm monitoring camera can achieve two functions
DVR card if accompanied by the words used together, can achieve PIR motion detection and the detection of double insurance, greatly reduces the chance of false report
540TVL High Resolution
The 36 dia. 5 IR LED, red light projected in different angles to make images more clearly.
Infrared light automatic start when light is lower than 10 Lux; infrared distance of 35 meters
Waterproof metal films imported lenses, anti-infrared image effects. Meet IP67 standards for water level
High-performance sensors detect camera, the effective detection distance of 5 meters