What type of adapter will I require in order to plug my electrical equipments?

What type of adapter will I require in order to plug my electrical equipments?

Nepal’s Electricity is 220 Volt and 50 MHZ (50 Cycles per Second). The Electric Plug is two or three round prongs, but not flat prongs as found in use in the United States or in other countries. If your electronic items use 110 Volt 60 MHZ electricity, you will need a voltage converter.