9VDC 1A Arduino Compatible Power Supply Adapter 110V AC 5.5 x 2.1mm Tip Positive Part#LJH -186
Brand: Corporate Computer

High quality switching 'wall wart' AC to DC 9V 1000mA wall power supply manufactured specifically for Electronics. The output is Center/Tip positive 5.5mmx2.1mm connector. These are switch mode power supplies which mean the output is regulated to 9V and the capable output current is much higher (1000mA!). For use with Arduino Uno, Mega and MB102 Power supply boards. These will power most projects that don't require more than 1000mA of current. Dimensions: 2.91 in x 1.57 in x 1.06 in (7.40 cm x 4.00 cm x 2.70 cm) Weight: 2.54 oz (72 g),

2-flat-pin plug
110V input voltage / 9VDC 1A output voltage
For use with Arduino Uno, Mega and MB102 Power supply boards
Connector size: 5.5 x 2.1mm
Center or Tip is positive, sleeve is negative