There are many ways to unlock the outdoor unit of IP video system.This video door phone is android intercom system. For example, you can unlock it with keyfob. If you forget your key, you can unlock it by code. Or you can make a calling to the indoor monitor. If you don't want to touch the device, you can choose to enter your face, and when you stand in front of the video door phone, the door will automatically open for you. It's convenient for you in a variety of ways. Specifications Model MK- AZZJ8A (Multi-apartments) Operating system Android 5.1.1 Screen Display 8 inch screen, 800*1280 px Camera 200W(1080P) CPU ARM Cortex-A53SMP4 Memory LPDDR3 …