PawBot is designed to run on 110-120V with 2.5 amps consumption.
If you are in Japan with 100V electricity, please use step up transformer with 500W or higher rating: https://www.amazon.com/s/field-keywords=100+to+110+transformer+500w
If you have 220V electricity, you can purchase a 220V to 110V step down converter rated at 300 watts or higher rating. Higher rating is better, so 500watt rated converters would be preferred. Example: https://www.amazon.com/s/field-keywords=220+to+110+transformer+500w