Voltage: 230V
Frequency: 50Hz
Plug Type: Type F (Schuko) - Two round pins with two grounding clips on the sides. Type C (Europlug) also works - two round pins without grounding.
Finland's 230V is higher than North America's 110V and Japan's 100V. However, most modern electronic devices (phones, laptops, camera chargers) are dual voltage (110-240V) and only need a plug adapter, not a voltage converter.
Check your device: Look at the power adapter label. If it says "INPUT: 100-240V" you only need a plug adapter. If it says "110V only" you need a voltage converter.
Devices typically dual voltage: Smartphones, laptops, tablets, camera chargers, electric toothbrushes, modern hair dryers
Devices often single voltage: Older hair dryers/straighteners, some small appliances, electric razors
If you forget an adapter: