Authentic Medium Size Panavision Clapboard.  Used by Hollywood Movie Studios and Production Companies this Clapboard can be used for actual film shoots on the set but also makes the ultimate souvenier for any movie buff/collector. Stand featured in the photo is not included.
 
Clapperboards are used to identify which scene and take a crew is shooting at any particular time, as well as where audio and visuals sync up during postproduction. 
Also known as film slates (or just slates), clapperboards are actually composed of two parts. The main part, the slate—named so because they literally used to be a piece of slate—has all of the identifying information about that specific scene, which helps editors properly select and place footage in the timeline. Attached to the top of the slate is a clapper stick; the “clack” sound it makes causes a sharp spike on the audio track, which the postproduction team matches to the video frame of the stick closing.