This is a 1970’s era, CB converter by Boman. It measures 4 1/2 by 4 by 1 1/4 inches. It converters a cars AM radio to a 23 channel CB radio. It has not been tested but looks to be in good condition and probably never used. It comes with the under dash mounting bracket and antenna cord. The box has some stains and some tears in it. Please contact me if you need more information. Thanks for looking!