This is a original MR 506 German SAR survival radio include the very rare and hard to find original Battery 16,8 V !!!!, As part of the equipment of ships and aircraft it serves the location of distressed crews, Manufacturer is the Becker Flugfunkwerk GmbH in Baden Baden, It is a transistor device, Frequency: 243 MHz (some devices also have 245.1 MHz that is Exercise frequency) Type of transmission: A2, A3, range in the air: 100 km at search altitude 3000 m., – can be switched by seat man separation or by hand, battery voltage 16,8V.-circuit or in each emergency radio are no buttons but reed contacts for the purpose of waterproof (waterproof) installed ,radio is in very good to exellent original condition with the original black cover for use with the Secumar survival vest and a manual card,very , very rare in this complete condition, BUT OFFER IS FOR DISPLAY ONLY! COLLECTORS ITEM!NOT FOR USE!!!