Cook Islands.

240 V · 50 Hz on Type I.

Type I10 A · earthed

Follows New Zealand practice: 240 V at 50 Hz with angled flat-blade Type I sockets. Kit from New Zealand or Australia plugs straight in; everyone else needs an I adapter, and North American 120 V appliances must also handle 240 V.

The voltage window

A nominal 240 V supply may legitimately sit anywhere between 216 and 264 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Cook Islands. Prose is our own.

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Pack an adapter — Cook Islands runs 240 V 50 Hz on Type I — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

Type A needs an adapter
Cook Islands's Type I sockets don't take a Type A plug.
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Type B needs an adapter
Cook Islands's Type I sockets don't take a Type B plug.
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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.