Azerbaijan runs on 230 V at 50 Hz, with sockets following Types C and F. A converter can stay at home; Azerbaijan supplies 230 V.
The same socket system is used in Russia, Iran, Indonesia and Lebanon, so one adapter covers all of them. Watch out when moving on: Taiwan, Brunei and Hong Kong use a completely different system. Across Asia this setup is common: 17 of 50 countries.
Protective earth
Grounded and ungrounded sockets may occur
Earthed sockets (Type F) and unearthed ones (Type C) exist side by side. For metal-bodied appliances the protective-earth path is what matters.