A case for housing and protecting an electronic device against moisture damage and contaminants is disclosed. The case includes a first member having a first plainer section and a first perimetric wall formed thereon, and a second member having a second planer section and a second perimetric wall formed thereon. The first perimetric wall and the second perimetric wall are engaged forming an overlap and a sealing structure for a watertight seal. The sealing structure includes a mated ring and a ridge-to-groove interlock. The case further includes a plurality interface feature accesses, including an optical access, an audio access, a button, and at least one open access for electrical connection. The case provides a cover with a plug adapted to cover up the open electrical connection access to form a watertight seal.