1) Give a introduction on the development of gadgets in the world.
2) first tell the audience what your favorite gadgets are
3) speak on the history of your gadget
4) then come to the topic how it works
5) tell them about its useful things.
6) How it helped you in many ways.
7) What are its advantages.
8) Give a conclusion.
And here's your points for a awesome speech..
BEST OF LUCK!!
THE IMPORTANT POINT IS DON'T GET SCARED OF AUDIENCES AND WHILE SPEAKING SHAKE YOUR HANDS AND SPEAK THIS CREATE A IMAGE ON PEOPLE THAT YOUR CONFIDENT