This vintage dynamic McMARTIN microphone adapter is a great addition to your collection. Made of polished stainless steel, it is a sturdy and durable unit. It has a variety of features, including a stainless steel case, and can be used with various bands. It was manufactured in the 1970s-1980s and is a great way to add some retro style to your communication setup. The unit quantity is one and it is a base station radio type. It was made in the United States and is unamplified. This product line is unknown and it comes in a polished stainless steel color. Plus the adapter in the pictures.