Leland Lilin Technology V- 16 color visual intercom JB-2003VCW, how to use JB-2004VCW?

JB-2003VCW is a home extension. JB-2004VCW is a home security extension, which can be connected with infrared probe, forced switch and smoke sensor. Jason Chung, the key is to the property management center. This key is not available if there is no network in the community. The small eye key is a monitoring key, and you can see the image of the host camera at the door. The small key key is the unlocking key. After answering the phone, you can open the door of the downstairs unit. The trumpet key is the answer key. Call the extension downstairs. After you press this key to answer, you can talk to the downstairs, and then press the key key to open the downstairs door.

Ask me if you don't understand.