On the off chance that you have connected numerous sensors or engines and your Arduino can't take the current from the USB port of your PC or you will control up your Arduino without USB port then you would need to utilize this connector. The particular is given underneath.
Input: 100V - 240V AC, 50 - 60 Hz 0.5A
Output: 9V DC 1000mA
Weight: 121g
Plug: US plug