A simple hat cam.
www.buymobius.com   |   www.mobius-actioncam.com/
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The video camera is a Mobius camera, shown here with several accessories. The camera is about $80 and the internal battery will run about 1/2 hour. The camera is at the left with a lens cap, an adjustable mini-tripod, an adapter with 1/4-20 thread, and a camera tray. Above is a roll of 3M Dual Lock used to attach the camera to anything to hold the camera. The 3M Dual Lock tape is similar to Velcro but the tape is symmetrical in that it sticks to itself and is much much stronger.