Try it First ? 90 Days Return or Exchange: BOIFUN promises 90 days ???????? return and exchange as well as a 3-year ????????????????. Intercom, Front Door Bell Security Camera: It can be monitored in real time via the "BoifunCam" APP without opening the door, which is safe and convenient. (???? ????????????????????????) 166 Wide Angel f/2.5 Aperture: The ?????? wide-angle field of view covers the area in front of the door. The f/2.5 aperture and CMOS sensor ensure moderate depth of field, proving background blur and clear details HDR Night Vision, Invisible Monitoring Without Red Light: HDR technology and AI chips manage complex lighting, with a high-sensitivity sensor for clear images even in backlight. The 940nm infrared fill light enables ????-?????????? ?????????? ???????????? without red exposure, automatically switching day/night modes for all-weather protection Ultra-Fast,Stable Response for Enhanced Security: Powered by a 1.2T AI chip and 128MB DDR memory, delivers ???????????? and more ???????????? response, processing 12,000 billion operations/s. With interference resistance and optimized WiFi transmission, it ensures a reliable connection, even with multiple devices connected or in areas with ???????????? ?????????????? (Not work with 5gHz WiFi) Comes with a Large-volume ??????????: Volume level 4, the maximum volume can reach 100 decibels, which can be heard when sleeping in the bedroom or cooking in the kitchen. (Of course, you can also set "Do not disturb") Easy Installation Forced Removal Alarm: ???????????????? Easy to install and with anti-theft alarm for complete security