Built-in microphone supports bi-directional communication between indoor monitor intercom and outdoor doorbell.ultra-clear sound quality without any noise.
Support to connect an delay function electrical lock to this system. With this function,you just need to press the unlock button on monitor. Support adjuast the time between lock and unlock. so, make you more safety.
In the standby mode,you could enter the setting for volume,color,brightness and contrast adjustment
The system Support 1 Monitor and 1 Doorbell Only