Thank you for looking. We have only confirmed that the power can be turned on and off. We have not performed any other checks. This is a junk item. Instructions are not included. The photos show everything. The purchase date and number of uses are unknown. The photos show everything. We are waiting for purchases from those who can understand and use it after carefully checking the photos. As this is a used item and has been stored at home, nervous individuals should refrain from purchasing. Only those who understand should purchase. The following is AI search information. Panasonic Intercom with Monitor Function, VL-SZ50KF - Brand: Panasonic - Model: VL-SZ50KF - Function: Monitor function Thank you for looking.