Meiwaku Denwa Checker WX07A - Power On Confirmed Thank you for viewing. Power on has been confirmed. An error code appears when only the AC cord is connected, but it is believed to be usable when connected to a telephone line. Please see the images for the product condition. Shuts out nuisance calls with light and sound. Can be easily connected to your existing telephone. Easy operation with large buttons. You can automatically reject nuisance calls with settings. The safety of the incoming call number is indicated by LED lighting and voice guidance. Collects and manages nuisance call information from all subscribers on a dedicated server. Can reject unknown nuisance call numbers with proprietary technology.