The grid in the Comoros 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: Congo, Gabon, Côte d’Ivoire and the Central African Republic use the same plug types. Nearby but different: Malawi, Botswana and the Seychelles – an adapter for the Comoros will not fit there. Across Africa this setup is common: 21 of 55 countries.
Protective earth
Grounded and ungrounded sockets may occur
Not every socket in the Comoros is earthed: Type E yes, Type C no. Class I appliances belong in an earthed outlet.