Hong Kong.

220 V · 50 Hz on Type G, Type D.

British wiring heritage throughout: the standard socket is the fused rectangular three-pin Type G, with old round-pin Type D lingering in some pre-war buildings. UK plugs fit straight in at 220 V, 50 Hz. Everyone else wants a Type G adapter, and 110–120 V devices must be dual-voltage to survive.

The voltage window

A nominal 220 V supply may legitimately sit anywhere between 198 and 242 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Hong Kong. Prose is our own.

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Pack an adapter — Hong Kong runs 220 V 50 Hz on Type G, Type D — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

Type A needs an adapter
Hong Kong's Type G / Type D sockets don't take a Type A plug.
the full story
Type B needs an adapter
Hong Kong's Type G / Type D sockets don't take a Type B plug.
the full story

Faces drawn to scale from pin dimensions · verdicts are physical fit + voltage math, not safety advice — when in doubt, ask the hardware store, not the internet.