http://a236.g.akamai.net/f/236/1428/2w/images.viewimages.com/wm/AA006760.jpg

A Hammer
PedroCartagena

"What's that?" "It's a highly technical piece of equipment we use in computer repair. Being a layman you probably don't know what it's used for. We call it a TwoByFour." Misquoted from the syndicated comic strip Shoe (if memory serves).

My father calls that a "hearing aid" - DavidBrantley