1. Real Machine Mold Opening, Fully Suitable For X4 Action Camera; 2. The Lens Material Is Pmma With A Light Transmittance Of 95%. After Coating With Ar Anti-Reflection Film, The Light Transmittance Reaches 98%. As Waterproof And Anti-Fingerprint Film, As Plus Hard Film, The Hardness Is 5h, Which Is Comparable To The Hardness Of Ordinary Glass And Is Anti-Fingerprint. Scratches; Waterproof Ring Material: Amorphous Highly Active Silica Gel; 3. The Protective Shell Is Made Of Hardened Pc, With No. 10 Fine Lines On The Inside And Outside, Making The Product Scratch-, Textured, Anti-Splash And Anti-Fingerprint; 4. 360-Degree Total Invisibility, Eliminating All Blind Spots; Optical Spherical Lens Design, Underwater Panoramic Splicing, Can Restore A Seamless Panoramic Picture; Material Of The Connecting Shaft Between The Main Body And The Back Cover: High-Hardness 304 Stainless Steel; 5. 50-Meter Full-Body Underwater Waterproof Design, Using Liquid Silicone Technology To Enhance The Waterproof Function, Very Suitable For Diving, Snorkeling, Swimming And Other Description: 1. Material: PMMA+Coating+AS+PC+Stainless Steel 2. Applicable Models:For X4 Colour: as shown Material: PMMA+coating+AS+PC+stainless steel Package Contents: 1*Waterproof Case 1* Adapter 1*Long Screw1 3*Alcohol Pad 4*Anti-Fog Inserts 1*Small Wrench 1*Storage Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.