See the big picture in 2K resolution: 166° wide angle, 4:3 aspect ratio, you can see from head to toe. No subscription required: The aosu video doorbell includes an 8G Micro SD card. Get accurate alerts with smart human detection: Adopting the latest AI algorithm to identify humans in the video and reduce false alarms caused by moving objects such as animals. Quick Reply and Voice Changer: When a visitor rings the bell, you can directly respond/hang up on a video hangout, or select a preset quick voice reply. AOSU 2K Wireless Camera Intercom, Can Make Calls Even When Away】Doorbell with camera (2.4GHz WiFi) Alexa compatible, entrance chime doorbell 166° ultra-wide angle, real-time video call, real-time alarm, can record, night vision function, AI motion detection, smartphone app compatible, cloud storage function, IP66 waterproof, Wi-Fi signal extension, USB charging, compatible with iOS/Android, indoor intercom for home/entrance/garden/store/parking lot, with Japanese instruction manual (Wifi doorbell) 833/19980