A notification device that uses light and sound, in a power outlet type. I probably haven't used it, but the box has been opened. The instructions are included inside the cardboard. [Notifies with Sound and Light] Chime Expansion Light Flash Receiver (AC Power) OCH-AC48-BLUE I probably haven't used it, but the box has been opened. The instructions are included inside the cardboard. This is an expansion device for those who already have a wireless chime. For other details, please check the manufacturer's page. [Notes] Since this is a check by an amateur, there may be oversights. Please understand that this is a used item. Thank you for viewing.