This project is a military-grade mobile phone case developed for iPhone 6 & 6 Plus in 2014. Its main selling points are IP68 waterproof and dustproof, four-corner enhanced shock absorption design, and anti-distortion and anti-bending side reinforcement design (because the iPhone material in that year was softer 6-series aluminum, the mobile phone was often bent). Unfortunately, although the product has passed all tests and DFM review, due to the long development time, the product missed the best time to market, so it could not be imported into mass production.