BOSE 1706 model with output level adjustment function for speaker systems. - Model: 1706 - Brand: BOSE - Model: 1706 - Connection Terminals: For speaker systems - Output Level Adjustment: Yes - Power Switch: Yes Unearthed from the depths of the warehouse during the year-end cleaning. Power-on only has been confirmed. Panasonic speakers will be attached for sound output confirmation. Since it's from several decades ago, it's basically treated as junk. Returns and refunds are not accepted. Additional Information: Accessories were found, so I've added photos (last page). I also checked the operation. Selector and volume are working OK.