This is a new, unused item that has been stored at home. The box is for a 530W model that was actually installed at my parents' house, but the contents are a 520W model. The "remove after installation" sticker has not been peeled off, so it is likely unused. Please note that the operation has not been confirmed. [Product Description] Matsushita Electric Works, Ltd. NAIS Rakuraku Genkanban Type 1 Master Unit WQS520W Intercom/Doorphone