Lorex SGQ4100 B/W Quad Processor View B/W video from up to 4 cameras simultaneously or individually in sequence on one monitor Includes 4 alarm inputs for connecting external devices such as infrared sensors Features resolution of up to 30 fps with 720 x 480 effective pixels RS232 communication port for PC-based management functionality (requires separate software) Utilizes BNC-type connectors for video inputs and runs on 12-volt DC power supply