To release the holder, there is an extended rubber tab located near the edge of the suction cup. Simply pull that away from the windshield and the holder will release. The junction located near the suction cup can only be adjusted vertically. Middle junction attached to the arms of the holder has 360 DEGREE maneuverability, allowing you to watch or use your tablet in a vertical or horizontal position. After adjusting to your desired angle, simply turn the two knobs to tighten it in place. Body and arms of the holder is lined with padded foam to protect your tablet from getting scratched. Specs for Devices Height: 4.25 in to 7.5 in Specs for Devices Width: 5.25 inches minimum WILL MOST LIKELY NOT FIT SMALL 7" TABLETS IT HAS A BULKY CASE.