What is the rating/amperage of the charge tube?

Specifications:

• Input power:        110-240AC volts 5V2A
• Input Frequency:  50-60Hz
• DC Output: 5V
• Total Current Limit: 2 Amperes
• Operating Temperature: 0 to 50 Celsius  / 32 to 122 Fahrenheit.

Notice to International Users:

Prior to traveling outside of the USA, please make sure to have a compatible plug adapter for use in the country to which you will be traveling.