The Altek Lansing M604 Speaker's System is a vintage audio device manufactured in the USA by Altec Lansing. With a frequency response of 20 Hz to 20,000 Hz and an impedance of 8 Ohm, this speaker offers high-quality sound for a vintage audio setup. The tested working condition ensures that you will be able to enjoy your favorite music and movies with crystal-clear clarity and depth, making it a valuable addition to any vintage electronics collection. works fine