Security-01 DC 9V 0.5A Power Supply Adapter, Plug 5.5mm x 2.1mm, Center Positive

Input voltage: AC 100-240V 50/60 Hz, Output: DC 9V 0.5A (500mA), Connector Size: 5.5mm x 2.1mm, Cable length: 2m

Power supply polarity: Center or Tip is positive (+), Sleeve is negative(-), PLEASE NOTE THAT this power supply only works with centain devices with center positive, refer to the following list

Works with Arduino UNO R3, Arduino Mega 2560, IEIK UNO R3 / MEGA 2560, A10 A15 A20 A25 A40 103 120 130 213 220 240 430

DOES NOT Fit: Effects Pedals, Drum, DJ controller, Piano keyboards, Label makers and other equipment with power ports of negative-tip (Center Negative). Not applicable for devices that withstand minimal electromagnetic interference, such as radio set

Note: A correct polarity is critical, a center negative pedal or device will not run on this adaptor