8 Channels (expandable) True Signal-to-Noise Voting Microprocessor Controlled Software Upgradable Menu Driven, 10 Menus Programmable COR and Disable Inputs Programmable Hysterisis Digital S/N Meter 12 Volt Operation @500 ma (user supplies power source) Board Size: 6 x 9 inches Rack Size: 1 Rack unit, 7 inch depth Enclosure size: 19 x 7.0 x 1.25 (measured in inches)