I wonder what is this thing is

On the one beautiful day I saw something on the floor so I picked up and put it in my bag it shape like a square and it has some kind of wired button. Beside i saw a strange person trying to find something so I try to help him. 1 hour later we still can’t find it,another 1 hour later we still can’t find it. I’am very tried to find so I ask him what is it shape like so he said it a square with a wired button on it so I know it in my bag so I ask him what is it call. And it call …. guess it???