The voltage in Myanmar is 220-230 Volts AC, running at 50 Hz.
Most of the international hotels have their own generators which provide a stable, continuous electricity supply.
Many other places experience power cuts and voltage fluctuation which can damage equipment like computers. It is therefore recommended that you carry with you a surge protector to ensure the integrity of your electrical items.
Most of the major hotels utilise the British 3 pin rectangular blade plugs, although you may find the Old British round 3 pin plug or the European round 2 pin plug.
It is advisable to travel with a multi adaptor for use with your electrical equipment.
Please Note: Most adaptors do not alter the voltage uptake so appliances designed for use on 110-120 volt supplies should not be plugged directly to the outlets without the use of an approved transformer.