This clever bit of kit allows you to assess the view the camera will record before you set up the unit to that location. The unit fits onto the back of the HD Hero camera, and saves a lot of time and hasstle in setting up the next location of the camera.
Its other use is as a playback screen for your video or camera photographs. It has a simple operation system which also allows fast forward/reverse and has a built in speaker with volume control for your video footage.
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