This vintage McMARTIN LO-Z microphone is a great addition to any collection of CB radios or radio communication devices. With a polished stainless steel casing and various band options, this unit is sure to impress. The microphone is a unit type and was manufactured in the United States in the 1970s-1980s.It features a dynamic design and does not require any amplification to function properly. This model is also known as the Turner Plus 2 microphone. This product is sold individually and is a great choice for collectors of vintage communication equipment. IT IS UNAMPLIFIED AND UNTESTED !