The product is a vintage ArcherKit Dynamic Headphone designed for radio shack in Japan. It has a double earpiece, brown and black color, and an adjustable headband. It has an impedance of 8 ohms. Each ear has a volume level knob on bottom. These were tested on my receiver at home and work fine at lower (lo-fi) levels with minimal bass. If you adjust the volume levels while sound is playing g you will hear a crackle but once you stop adjusting it stops. The speakers are limited so If you try and turn them all the way up during playback or with a song with heavy bass they cut out. The original thin foam over the speakers is torn but not deteriorating.