Works well, used at home until listing, with good sensitivity. Lightly cleaned. AC100V power supply, wired type. Connection method is explained in the photos. The main unit (indoor) has some discoloration due to aging of the white plastic. The mounting base for the sub-unit (outdoor) is a new Panasonic product. When replacing a Panasonic intercom, I used the existing Aiphone base, so I have a new Panasonic base left over for sale. The size is the same and the fixing is fine, but it seems to sit a little shallow. Please refer to the photo from the side of the sub-unit. Also, due to outdoor use, there is discoloration, clouding, and scratches due to aging. Due to these conditions, I will treat it as junk. Please read carefully ※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※ Shipping will be via Yamato Compact nationwide. This is a used item that has been in storage for a long time and is considered junk. Please understand that cancellations, returns, and complaints are not accepted after purchase. ※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※