* Fully US Regulated Power Supply Adapter. * Center or Tip is positive, sleeve is negative. Automatically converts international voltages, up to 1A output. * Compatibility with: Arduino UNO R3 Mega 2560 1280, Arduino CCTV. Works with devices require 9V and 1000mA of DC power and physically fits the plug. Please make sure the connector size 5.5x2.1mm can fit your applications before purchase. * DOES NOT fits Effects Pedals, Drum, DJ controller, Piano keyboards, Label makers and other equipment with power ports of negative-tip. Not applicable for devices that withstand minimal electromagnetic interference, such as radio set.