Features: The waterproof design at depth of 40 meter is very suitable for diving, snorkeling, swimming, and other water sports. High density composite materials, resistant to impact and compression. The airtightness of the protective casing is strong, which can not only be waterproof, but also prevent dust from entering the camera. Boosting type underwater touches screen back cover, allowing for underwater control of the screen. 99% Light transmittances, clear and natural shooting. Stainless steel buttons, precise alignment of bare machine buttons, sealing rubber rings, pressurized card slots to prevent water fron entering. The three fold buckle is not easy to fall off, making diving more reassuring. Specifications: Main Material: PC+stainless steel+optical glass Color: Clear Size: Approx. 8.5x4.4x7.5cm/3.34x1.73x2.95inch Applicable Model: for Action 3/4 Sports Cameras Support Water Depth: 40 Meter/131ft Package Includes: 1x Waterproof Shells 1x Quick Adapter Base 1x Fixed Long Screw 2x Antifogging Film(Pack) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.