This is a high quality 'wall wart' AC to DC 9V 650mA wall power supply. These are switch mode power supplies which mean the output is regulated to 9V (no more 14V outputs) and the capable output current is much higher (650mA).
These will power most projects that don't require more than 650mA of current. This wall wart has a center-positive 5.5x2.1mm barrel connector and works with 100-240VAC inputs.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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Power supply for Arduino, when not plugged into computer - worked fine!