Fully Automatic Antenna SWR Tuner with built in LCD Digital Watt SWR Meter! Great For Amateur Radio, CB anf HF use. Simple and Fast push button and tune operation. Hooks up between antenna and radio with an optional PL-259 coax path cable. Requires 12Vdc. Can be used with all Amateur and CB Radios, handles up to 200W P. E. P.