The RAM Twist Lock Suction Cup Mount is designed to have a strong hold on glass and non-porous plastic surfaces. It has a double socket arm, 3.25" suction cup twist lock base, diamond adapter base and Tab-Tite cradle. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at the base and cradle. With a twist of the arm knob, you can move the Tab-Tite^TM cradle to your optimum viewing position. This mount is designed to hold the following devices: Apple iPad Apple iPad 2 Apple iPad's with bumper or case including the Otterbox case HP TouchPad