Types C and F, 230 V, 50 Hz – those are the basics for electricity in Lithuania. 230 V means no voltage converter – only the plug shape matters.
The same socket system is used in the Netherlands, Finland, Spain and Ukraine, so one adapter covers all of them. Watch out when moving on: Malta, the United Kingdom and Gibraltar use a completely different system. 31 of the 50 destinations in Europe share the plug types of Lithuania.
Protective earth
Grounded and ungrounded sockets may occur
Mixed supply: Type C without earth, Type F with earth. Which one is in your room only shows on arrival.