Metal case is 5 1/8 x 4 1/2 x 3 inches.Measures power 0 - 5 or 0 - 50 or 0 - 250 or 0 - 1000 watts.26 - 30 MHz Peak Reading.SO-239 UHF connectors on rear to connect to radio (jumper required) and antenna.Socket on rear to connect to 12 Volts to light meter.