1. ND filter: is used for light reduction under strong outdoor light, can realize large aperture shallow depth of field shooting under strong outdoor light (the larger the value of ND, the higher the degree of light reduction) 2. CPL polarizer: mainly eliminate non-metallic reflections, get rid of glass reflections, increase the concentration of blue color in the sky, so that the white cloud picture is more transparent, improve the clarity of the picture, so that the water and underwater objects are more clear and transparent 3. UV protection lens: hard coating process, effective protection of the lens, thin frame without dark corners, high light transmission, multi-layer coating to reduce the effect of light refraction, no color deviation, to improve the quality of the picture 4. Nano double-sided multi-layer vacuum coating process, double-sided transmittance enhancement film, reduce ghosting, dirt and water resistant, oil resistant 5. Optical glass lens, clear image 6. Lightweight and compact, easy to carry and install 7. Size: about 2.7 x 2.4 x 0.2cm 8. Weight: about 0.7g 9. Description: delivery does not include a drone