Power on, confirmed. Operation is at an amateur level, but tape playback, rewind, and fast forward have been confirmed. I checked with headphones, and the amplifier knobs and buttons seem to be working. The tape counter does not move even when the tape is playing. Since it's old equipment, I'm selling it as junk. How much it was used is unknown. It has been stored in a storage room for nearly 20 years since it was last used. Technics RS-613U Stereo Cassette Deck Release Date: Around 1977 Dimensions: Width 41cm x Height 13.5cm x Depth 30.5cm Technics SU-7600 Integrated Amplifier Release Date: Around 1977 Dimensions: Width 41cm x Height 13.5cm x Depth 30.5cm No instruction manual. The condition assessment is based on my subjective judgment, but I try to describe it accurately to avoid discrepancies with the actual product. There are individual differences in how people perceive the condition of the product, so please understand that it is a "used item," and those who are sensitive or looking for a perfect item should refrain from purchasing. Product images may slightly differ in color and texture from the actual product, so please be aware of this.