The Elegoo Uno starter kit contained everything as stated in the description. It all works fine. It is not essential, but if you are new to Elegoo/Arduino stuff I would recommend buying a 9 volt power adapter to run it all from if you haven't got one already. Make sure it is the proper socket size. You can then run the Uno without your laptop which is more impressive. The Elegoo/Arduino kit is ideal for learning about programming and electronics. If you can't get your mind around programming there are thousands of free sample programs online to copy that will work all the electronic bits for you.
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