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; such housings waterproof at a depth up to 60 m, each incorporating buttons for operation of the camera, a silicon gasket designed for waterproofing, a flat and optically-coated glass lens, an aluminum heat sink and adjustable neoprene/hook and loop closures on its wrist straps (provided for in subheading 4202.99.90).

This HTS classification covers specialized cases designed for use with cameras classified under subheading 8525.80.40. These cases are constructed from clear polycarbonate plastics and are engineered to attach a camera to a user's wrist. Key features include waterproofing up to a depth of 60 meters, integrated buttons for camera operation, a silicon gasket for sealing, a flat optically-coated glass lens, an aluminum heat sink for thermal management, and adjustable neoprene/hook and loop wrist straps. These are specifically designed for action camera accessories.

As a classification within Chapter 99, which deals with temporary legislation and modifications, this entry is distinct from the general merchandise headings found in the earlier chapters of the HTS. While siblings in Chapter 99 would also fall under temporary trade provisions, the specific product and its intended use differentiate it. For instance, other temporary classifications might relate to agricultural products, specific industrial goods under quota, or items subject to special import duties, none of which would encompass camera accessories like these waterproof housings.

Since this HTS code is a leaf node, there are no further subdivisions. The detailed description precisely defines the parameters for classification, meaning that goods meeting these specific technical and functional criteria will be classified here. Any variations in material, waterproofing depth, or functionality would necessitate a review of alternative HTS classifications, potentially outside of Chapter 99 if they do not meet the specific temporary provision requirements.