The CPL filter is delivered in a box (gift-ready). It contains a fixed pocket with zipper and contains the filter with the magnetic chassis, which looks very high-quality, and a microfiber cloth. Two stickers (anti-slip strips) Not included: A lens cap to protect the filter (too bad, cheaper providers can do that). An instruction manual is also not included. Further information can be loaded via the QR code. The CPL filter fits smartphones with larger displays. Place the magnetic holder on the smartphone with MagSafe function. It also works on the smartphone chassis. Do something — it fits perfectly and makes a really high-quality impression. The filter is just as easy to dock. A smaller power bank or video light can be used despite the holder on the iPhone. With its 67 mm thread, the filter is large enough in diameter to run across the entire lens (i.e. all three lenses on the iPhone XYZ Pro Max, for example). This allows it to be used with all available apertures. The rest is try and error. With a bit of practice, you can significantly improve your photos. Why such a filter on a smartphone anyway? Street and architectural photography in particular has to contend with reflections in the photo. These filters can prevent them — especially on water bodies. In addition, contrasts are reinforced in the photo and the saturation of the colors is worked out more. However, using them requires some practice — you will always adjust the filters a bit to achieve maximum effect. So it's not a photo tool that you take out and put on your smartphone — and it's good. Training by doing! For just over 30 euros, you get a nice utility for somewhat more professional photography with a smartphone in fairly good quality with accessories. Buying recommendation