; each incorporating buttons for the operation of the camera, an opaque plastic base that clips into a camera mount, a thumb-screw on the base mount that allows for adjustment of the camera viewing angle on a pivot, a silicon gasket in the door of the case that allows for waterproof operation of the camera at a depth of more than 40 m but not more than 60 m, a flat and optically-coated glass lens and a heat sink to dissipate camera heat (provided for in subheading 4202.99.90) Free No change No change On or before 12/31/2020 . 1135. Camera wrist housings Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.12.52 Cases of clear polycarbonate plastics, designed for use with cameras of subheading 8525.80.40 to affix camera to the user's wrist