Why Thai Hybrid Wall Sockets Fit Both US Flat-Prong and European Round-Pin Plugs
Thailand operates on 230V at 50Hz and uses clever hybrid wall sockets (Thai Standard TIS 166-2549 / Type O) that accept 2-flat-prong flat prongs AND Type C/O round pins without an adapter! However, voltage is still 230V—so never plug a 110V-only North American or Japanese hair appliance directly into the wall.