When choosing one of our adapters you need to know:

1) Output Voltage, Current and Wattage.

Volts and current (mA) are printed on your original adaptor, and often also on the device that uses the adaptor.

Choose a voltage equal to the original voltage and of the same type (AC or DC).

Choose current (mA) equal or higher than the original amount, NEVER lower.

Choose a wattage (w) equal or higher than the original amount, NEVER lower.

2) Output Polarity

AC to DC adaptors will have a negative center or a positive center.

NEVER choose an adaptor with the wrong polarity.

AC to AC adaptors have no polarity requirements.

3) Output Plug Size

There are a number of different output plugs.

Output plug size is most often measured and expressed in milli-meters (mm)

A plug size of 5.5mm OD x 2.1mm ID means that the outer diameter is 5.5mm and the inner diameter is 2.1mm.