Apple Performa 6400/180 - Manual (Page 18)

Basics Voltage Switch - 16
Here is a table listing voltages for some countries:
Country Voltage
Japan 100
Algeria, Indonesia, Lebanon, Libya, Peru, S. Korea, Vietnam 100 or 220
Ecuador, Jamaica, Philippines, Taiwan
110
Bermuda, Canada, Puerto Rico, United States, Venezuela 120
Colombia, Mexico, Saudi Arabia 127
Brazil 127 or 220
Hong Kong 200
India, South Africa 220-250
Israel, Pakistan, Singapore 230