Features: 1.Protective Case Combo, 45M waterproof New upgrade, Hydrophobic coating For full scene. 2.Explore 45M deep ocean, No fear of pressure, Built-in high elasticity waterproof seal,no water penetration under strong pressure. 3.Highly translucent glass reveals true colours With 95% light-transmitting tempered glass,see the colorful underwater world. 4.Drip-free, clear vision, Waterproof coating added to the front of the lens,no dripping or staining to ensure blur-free shooting 5.Skeleton backdoor for a wider range of applications, With replaceable backdoor, it's for non-diving use, and has three advantages! 6.Sturdy protection,full of security,The waterproof case is even more protective, made of high-strength PC, which is effectively resistant to drops, scratches and punctures. 7.Precise alignment,high quality materials, 316 marine grade stainless steel for precise,key alignment and tactile feedback on bare keys. 8.Effective anti-fog, smooth shooting, Complimentary 9 pieces of anti-fog film to effectively, prevent the problem of fogging due to temperature differences. Specifications: Product size: 78.6* 78.6*40mm Weight: Protective case 89g, skeleton backdoor 16.9g Product material: Environmental protection PC + 31 6 stainless steel + high transparent tempered glass. Package includes: 1* Waterproof case 1* Skeleton backdoor 1* Locking screws 1* Movable base 3 packs of anti-fog sheets (9 sheets in total)