It's a 3D Printable HTC One X / One XL / One X+ holder!You need an existing suction mount / dash mount unit with a "T Slot" connection (see pictures). These are available cheap on ebay or from some phone accessory shops (but try to make sure you get the right type! There are a few different ones!)It allows connection of a charger, access to power and volume buttons and has a cut-out for the camera.Print in ABS as PLA will likely melt in a hot car!