Shell material: Hardened PC with textured finish on the inside and outside, providing scratch resistance and resistance to fingerprints Lens material: PMMA with 95% light transmittance; after AR anti-reflective coating, transmittance reaches 98% AS waterproof and fingerprint-resistant film with added hard coating, surface hardness 5H, comparable to standard glass hardness, offering scratch resistance; enables clear photography without smudges or glare. Waterproof ring material: amorphous high-activity silicone Connecting shaft material between body and rear cover: high-hardness 304 stainless steel Installation steps: 1. When installing the camera into the fully invisible diving case, ensure the camera is centered; gently shake to confirm proper positioning 2. The diving case supports a waterproof depth of 50 meters; button spring hardness meets specific compression standards 3. When pressing the diving case button, apply gradual force with your finger, increasing pressure as you press down. Press the button fully to its limit, hold for 2-3 seconds, and wait for the camera indicator light to turn on before releasing Waterproof depth: 50M Product weight: 134g Color: Transparent Material: Plastic Dimensions: 156 x 84.2 x 83.6mm Package Contents: 1 x Action Camera Diving Case Note: Light reflection and display differences may cause slight variations between the product color in images and actual color. Measurement tolerance: +/- 1-3cm