DFRobot - Wall Adapter Power Supply 7.5VDC 1A (American Standard)

This is a 7.5V wall adapter.  It is not commonly available in the market.  The best part of this adapter is that it allows Arduino project to run independently.  For some projects need motor or servo, 5V  do not have the sufficient power, 12V is kind of over-supply that may cause potential overheated problem. 7.5V is just the right voltage for those projects, provides safe and enough power.    It comes with a  DC2.1 connector which is Arduino power jack compatible.  Plug&Play!