The power adapter included with the UD-3900 supports electrical voltages ranging from 100-240V, and electrical frequencies ranging from 50Hz and 60Hz. When purchased within in the U.S., the power adapter includes ‘prongs’ or ‘blades’ for U.S. style power outlets. When purchased within the UK or EU, the power adapter includes prongs for both the UK and EU style power outlets. When purchased within Australia, the power adapter includes prongs for an Australian style power outlet. At this time we do not offer prongs for any other outlet style. If necessary, a simple ‘travel style’ adapter can be used in conjunction with the power adapter to work with other styles of power outlets.