Electricity is supplied throughout New Zealand at 230/240 volts, 50 Hertz. Most hotels and motels, and some homes, provide 110-volt AC sockets (rated at 20 watts) for electric razors.
For all other equipment, you’ll need an adapter or converter, unless the appliance has a multi-voltage option. Power outlets only accept flat 3 or 2-pin plugs, depending on whether an earth connection is fitted.