(Management number mw0066tpj) Two out of six units have had the tape removed and the contents inspected. Unused. Since the operation has not been confirmed, only those who agree to no returns. WZ-VC160 Panasonic In-Wall Volume Controller (0.5-60W) *Speakers whose volume can be adjusted with a volume controller are only high-impedance speakers used in schools, hotels, etc., and cannot be used with low-impedance speakers used in homes, etc. *Please select the volume controller according to the W (watt) number of the speaker to be used. Also, within the range of W (watt) numbers, multiple speakers can be connected and adjusted together.