AC Line Power Supply: 9V 1A

 AC Line Power Supply:  OUTPUT: 9V 1A
INPUT: 115-240Volts with USA type plug, works in all countries. Dimensions: 3 inches long, 1 inch wide, 1.5 inches high

9V power adapter, maximum output of 1A, connects to the external power supply terminal of Arduino.
Efficient Electronic type.

NOTE: This can be used to power an Arduino via the DC Power jack.. Arduino needs 7V or more (often 9V is used) for External Power.