7-inch surface-mounted visual indoor unit instruction manual

7-inch surface-mounted visual indoor unit instruction manual, which introduces the product's features and characteristics, including normal intercom operation, intercom call answering, intercom volume setting, image storage, forced execution function, intercom call termination, intercom call re-answering, ringing shutdown and re-opening, switch function, door opening, lighting switching (only using switch actuator), menu bar-fast access, menu bar folding or opening, ringing volume setting, image storage call, camera call, internal call, automatic internal call device on or off, automatic door opening device on or off, settings and other contents.

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