EZVIZ CS-HP4 HP4 Wire-free Peephole Doorbell, 1080p HD, 155° Ultra-Wide Angle, 4.3-inch Color Screen, Night Vision (Up to 3m), 4600mAh Rechargeable Battery, Wi-Fi, Cloud & MicroSD Storage (Up to 512GB), Two-Way Audio, Easy Installation, Black | CS-HP4

Installation Parameters Supportive Hole Diameter 15.5 to 50 mm Supportive Door Diameter 35 to 105 mm (1.38 to 4.13 inch) Sensor 1/3" Progressive Scan CMOS Lens 2.0 mm @ F2.2, visual angle (diagonal):155° Day/Night Switch ICR infrared filter IR Distance Max. 3 m Max. Resolution 1080p / 2MP Video Frame Rate 15fps Interface Storage Interface MicroSD card slot (max. 512 GB) Audio Input Built-in high sensitivity microphone Audio Output Built-in high-power speaker Buttons Doorbell button, power button, Screen wake up button Network Protocol EZVIZ Cloud Proprietary Protocol Video Intercom Local and remote video intercom General Function Cloud video encryption and image encryption