Hong Kong flats can have a main door, a metal gate and an existing peephole with different fitting requirements. Compare video doorbells for viewing and answering visitors, and smart peephole door viewers with indoor screens for checking the entrance.
Check the door and answering setup
Match a peephole viewer to the door thickness, hole diameter and space for its indoor screen.
Battery, wired doorbell power and PoE models use different power arrangements. Verify the compatible chime too.
Check metal-gate obstruction, backlighting and corridor angles. A face-level view and a parcel-level view are different tasks.
Remote answering, motion notifications and recorded history depend on the camera and service plan. Check building-management requirements before fitting a device. Set the view, audio, shared access and retention period around the entrance you need to monitor.
