For businesses, the real value is the log. Every entry is time-stamped, so you know exactly who opened the shop at 6 a.m. or accessed the storage room over the weekend. Lost a fob or parted ways with an employee? Deactivate their access in seconds instead of re-keying the building. For homes, a video intercom means you see and speak with whoever’s at the gate before the door ever opens — from the couch or from across the country.