High quality switching wall wart wall adapter AC to DC 5V 1A wall power supply. These are switch mode power supplies which mean the output is regulated to 5V. They take 100-240Vac 50/60Hz input and output 5V 1A. These will power most projects that dont require more than 1A of current. Center-positive 5.5x2.1mm barrel connector.They are design to take up ONE position on your outlet strip or wall outlet. These will convert international voltage (100V-240Vac 50/60Hz) automatically; no transformer needed. The cable is 4.5 ft. long. Red LED indicate supply OK. Great for many electronic projects!There are 3 things to watch for when choosing wall adapter:
1) Voltage and Current (5V, 1A)
2) Plug size (2.1mm)
3) Center polarity (Positive center)