1. Use with Hero9 waterproof case2. Used for underwater shooting with a depth of 5-25 meters.3. The red filter is suitable for tropical and green water systems, and is used for color correction when shooting underwater divingApplicable el: for GoPro HERO9 Action CameraPink filter:Correct color deviationRestore blue colorSuitable for submerged useRed filter:Correct color deviationRestore green colorSuitable for seawater shootingPurple filter:Correct color deviationRestore green colorSuitable for fresh water shootingMaterial:Plastic + glasscolour:Red+purple+pinkPackage Contents:1 x Red filter1 x purple filter1 x Pink filterOnly the above package content, other products are not included.Note: Light shooting 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.