The grid in Niger works at 230 V and 50 Hz; the recorded sockets are Types C and E. 230 V means no voltage converter – only the plug shape matters.
Handy for multi-stop trips: Benin, Djibouti, Togo and Congo, The Democratic Republic of the use the same plug types. Travelling further to Nigeria, Zambia and Botswana means a different adapter. Across Africa this setup is common: 21 of 55 countries.
Protective earth
Grounded and ungrounded sockets may occur
Niger has sockets with a protective earth (Type E) and without (Type C). A plug that fits mechanically does not guarantee earthing.