Stromberg-Carlson best Sound Powered

Product Name: Stromberg-Carlson best Sound Powered
This Auction is For: A Used Vintage US Navy Stromberg-Carlson Sound Powered "Deck Talker" Radio Headset/Chest set - H200 This unit has a lot of wear due to age, use and storage. Also scratches on the metal. This has not been tested. I do have more to sell if needed. #1 *** Free USPS Priority or FedEx best Shipping in US *** Please look at the pictures carefully to get an accurate description of condition and feel free to ask questions. From the introduction in the H200/U manual: "Sound-powered telephones are just what the name implies. They are telephones powered by the sound pressure of your voice rather than batteries or an electrical power source. If your phones work properly, speaking in a strong, clear voice generates enough current to carry your voice to all other phones on the circuit.".