Multi-device use: Connect up to 2 CCTV cameras, 2 doorbells, and 4 monitors. Insert the male BNC connector into the female BNC connector of the camera and tighten it securely. Connect the 2P jumper wire between the "+" and "-" terminals of the male BNC connector and the CAM1 or CAM2 port (Only supports 2MP 1080P AHD cameras). 7-inch TOUCH MONITOR & 1080P Doorbell: 7-inch touchscreen monitor, touch operation, hands-free, supports Wi-Fi for internet connection. Attractive outdoor doorbell with waterproof cover, built-in infrared sensor, and 1080P camera with a wide 120° viewing angle. 140°, night vision, waterproof, dustproof, and vandal-proof. You can connect all 12V electronic locks. Motion detection and automatic recording: The wireless video intercom is equipped with motion detection: when visitors press the doorbell or motion is triggered, the doorbell camera will automatically record videos or snapshots and save them to the additional Micro SD card (32GB card included) to protect your home every day. You can view it on your mobile phone or monitor. Anti-tamper alarm: The Montor supports an outdoor doorbell camera + an AHD CCTV camera, providing dual security monitoring, safer and more comprehensive surveillance of every corner of the house, and supports Montion detection. Your phone can receive alerts, enhancing the CCTV anti-tamper alarm function, so thieves have nowhere to hide, providing a safe living environment. About wiring: The monitor to the doorbell needs to be wired with 4 wires. You can extend the distance from the monitor to The doorbell uses RVV4 (4-core wire) / Cat5 / Cat6 cable as needed. The maximum distance between monitors is 100 to 200 meters. The main monitor can be connected to your home Wi-Fi network, allowing you to view visitor information via your mobile phone at any time.