Açıklama
Suitable for a family, three room or upstairs downstairs, visitors outside a doorbell, three visible indoor machine at the same time the bell rang and open the image, touch any indoor machine answer key and visitor conversation, touch the lock button, the electric control lock automatically open, don’t run to the door open, usually in standby, touch monitor key, can monitor the external environment. Touch button visible inside machine and visible within the machine can call and talk to each other ..
