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Actually the conclusion is the summary of your essay. It is not a separate one and it should not contradict your essay. It depends on what you have written earlier.

It is not the gadgets that make our life more comfortable or insane. It is we that make our life comfortable or insane, by over using or getting addicted to the gadgets.

If we see too much of TV, it is not good for the eyes and for the brain (it becomes dull).  But it is a pass time and can be used for learning events that are happening around. We see more of electronic products like mobile phone, social sites, music players, cameras than other type of products there days. The radiation from these gadgets could harm a little too.

If we do not depend too much on the gadgets, improve our life by using them but not becoming addicted to them, then we are making our life comfortable. IF we cannot live without them and we use gadgets more and interact less with people, then one is likely to develop some disorders.