Thank you for viewing. ■ Product Features This is an extremely tough protective case designed to protect small precision instruments and valuables from harsh environments. - Excellent protective performance: It has high airtightness, waterproofness (IP67 standard), impact resistance, and dustproofness. - Automatic pressure equalization valve: Equipped with an automatic pressure equalization valve that keeps the internal pressure of the case the same as the outside while preventing water from entering, allowing for smooth opening and closing even in environments with pressure changes, such as on airplanes. ■ Main Uses Ideal for transporting and storing small precision instruments such as mobile phones, portable measuring instruments, cameras, and earphones. ■ Product Dimensions Internal dimensions: Approximately 126 x 80 x 35mm External dimensions: Approximately 173 x 120 x 53mm Although there are many scratches and stains, it is still a usable waterproof case.