5-in-1 Unlock: Our video doorbell has 5 unlocking methods. You can unlock by password, fingerprint, IC card, APP, and monitor. Very convenient and flexible. 5 passages are included in the delivery. Allows you to open the door whenever you want. About Wiring: The monitor to the doorbell must be wired with 4 wires. We provide a 3m 4-wire cable for each doorbell for basic installation, a 1.2m external power supply for each monitor. You can extend the distance with a 4-core wire. The main monitor can connect to your home Wi-Fi network. Allows you to view visitor information on your mobile phone at any time. Motion Detection: The wireless video intercom is equipped with motion detection: when visitors press the doorbell or the motion detection is triggered, the doorbell camera will automatically record videos or snapshots and save them to the additional Micro SD card (32G card included) to protect your home every day. You can see it on your mobile phone or monitor. 10" Touch Monitor &