This plastic Caruba Professional Director's Clapper white/color (whiteboard marker) is a convenient tool for film and video producers. Synchronizing sound and vision is a piece of cake. The clapper can also be used to mark specific scenes and takes. The sharp "clap" sound from the board, is easy to identify in the audio track and the closing of the clapper is easy to find in the video track. The two tracks can precisely be synchronized by synchronizing the audio with the video.