2/3/4 Units Apartment intercom system Video Door Phone Intercom Kits Aluminum Alloy Camera 7" Monitor video Doorbell 7 RFID Card

2/3/4 Units Apartment Video Door Phone Kits * With 4 wires system connection. Using a 4-core cable to connect the camera and monitor. The max distance is up to 100 meters. For different distances, use different diameter cables, please check the following form to choose correspnding cable. ( We will send 5 meters cable to you to test, for the longer cable, need to buy by yourself when installing) * Handsfree Dual-way Intercom and Indoor Monitoring When a visitor ring the bell, the monitor will be activated and show the image outside. Press the answer button, then you can talk outside, press the answer button again to turn it off. If you do not press the button after the conversation is finished or if no one answers the call, the monitor will turn off automatically after the 60s. ​ * Multiple ringtones - free switch The 25-chord ringtones can be switched freely, elegantly, and fair-sounding. Both the ringtones and volume can be adjustable and can meet the original needs of your