What does Bhargava say is the only side effect of using the Free Electric device

Bhargava says the only side effect of using the Free Electric device is that it can provide one home with electricity for 24 hours, but it depends on what is being powered.

Explanation: The Free Electric bike is a revolutionary invention that is able to  generate electric power to a house for 24 hours. It consists of someone pedaling it in order to get energy, and it doesn't need fuel nor to be charged. However; the only side effect that it can bring, would be that the electricity created is limited If something big is being charged.

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

your answer would be: d) eye contact