This vintage Realistic Radio Shack Duofone Telephone Amplifier System Model 43-275 is a rare find for any collector or enthusiast. The system was manufactured in Korea, Republic of in 1976, and has been well-maintained over the years. The brand is Radio Shack, a household name in the world of electronics. The amplifier system is perfect for those in the business and industrial sector, as well as for office and telecom systems. The item is used but in excellent working condition. The package includes the amplifier, power cord, and original manual. Add this unique piece of history to your collection today!