Isodynamic headphones TDS-15 were produced by PO "Schetmash", Chisinau and NPO "Ferrit" (plant "Magneton"), city of Leningrad. They were intended for individual listening to stereo programs of high-quality household radio equipment of the highest and first groups of complexity. Sound frequency range: 20 - 20,000 Hz Frequency response in the range 20-20000 Hz: 14 dB SPL @ 500 Hz @ rated power: 94 dB Rated input power: 2 mW Nameplate power: 1 W Total harmonic distortion: 0.3% Nominal impedance of inputs: 16 Ohm Dimensions: 240x195x75 mm Weight: 0.3KG Headphones from the 80s of the USSR. Excellent conditions. Good sound. The speakers are working. The genuine leather lining is intact. The wire from the connector to the headphones is 2 m. Everything is preserved. See photo.  For lovers of retro and good quality