Photo of the day, #160

Hint: every room has at least one of these

Hey regular followers! Hope you are having a good day. Sorry I haven't been posting daily, as I should be. Thanks for putting up with me. You are too kind. And since I  missed yesterday's post,  I will be posting 2 photos today. It's double the fun! Anyways, today's thingamajig is a very common item. Everyone should know what it is. You may have one in front of you, as you read this.  It is a small item, about the size of a playing card. What is it?