You have to be the parent that you are, always remembering that your goal is ensuring your child’s safety, comfort and best interests. You have to stop rebellious behavior before it becomes a nuisance.
Your child may love fiddling with gadgets and while it looks cute the first time, you will soon realize that meddling with these gadgets can only cause harm to your own child as well as to the appliances. Cue to step in and stop the undesirable behaviour.
You need to approach the situation seriously. Your child may not be old enough to understand the language but he will definitely recognize the severity of the tone and back off. Of course, being the inquisitive child that he is, he will probably come back to it even after you say no. You have to be consistent, not give in and always respond in the same way.