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CC0 1.0 Universal
The Arduino will not provide enough current to drive the two servos, so a separate power supply is needed. Note where servos are soldered (on the 5V supplied from the Arduino). So either cut the 5V trace, as pictured, or solder the servos in a different spot.
5V servo power supply uses a 3-pin keyed header.
To power the Arduino as a whole you use the USB cable, needed anyway to program the Arduino.
-2 hobby servos (recommended: GWS S03T STD servos)
-5V wall wart power supply for servos
-assorted wires and headers
-#4-40 x 1" screw for axle