China.

220 V · 50 Hz on Type A, Type I.

Wall outlets usually come as a combined unit: a two-blade Type A opening above a three-slot angled Type I for earthed equipment, all at 220 V and 50 Hz. Ungrounded European-style two-pin plugs also fit many multi-standard sockets. North American devices must be dual-voltage; most European gear needs only an adapter.

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 — China. Prose is our own.

Calling codes by Dialchord

From usKeychord— keyboard shortcuts for every app

Coming here from somewhere else?

My plugs are fromI'm going to

Plug straight in — China runs 220 V 50 Hz on Type A, Type I — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

Type A fits
Seats fine — this plug is unearthed by design.
the full story
Type B needs an adapter
China's Type A / Type I 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.