AnjieloSmart New 2/3/4 Unit Video Intercom System Doorbell with 7 Inch Monitor Doorphone for for 2-4 Household Apartment

7 inch Video Door Phone Intercom System for 2 / 3 / 4  ApartmentsCamera *With 4 wire system connections. Using a 4-cores cable to connect the camera and monitor. The max distance is up to 100 meters. Different distances, use different diameter cables, please check the following form to choose the corresponding 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 of the ringtones and volume can be adjustable, can mee