Picked up this K&F Concept clip lens as a fun add-on for me and my photo-happy teenager. Out of the box you get a tidy little case with a lanyard, and while the zipper was stiff at first, it loosened right up. It's listed as compatible with iPhone 17, but I clipped it straight onto my iPhone 13 without drama and was shooting in seconds.Pros: The clamp mount is solid and non-sticky, so no weird adhesive on your phone. It visibly changes the image--slightly darker and more diffuse--so you can see a real "before/after" when you pop it on and off. Big bonus: it uses a 58mm thread (Nano K-series 58mm), which means you can experiment with other 58mm lenses if you've got them. Setup is simple--just thread carefully and you're good.Cons: The packaging doesn't clearly say what specific type of lens is included, which is a head-scratcher. You'll want to clean the glass before shooting, and the threading needs a gentle hand. Also, the effect isn't some mind-blowing transformation--think subtle mood shift rather than a whole new camera.Bottom line: A neat, affordable way to experiment with mobile photography. Great for tinkerers and casual shooters who enjoy playing with looks; not for someone expecting a dramatic optical overhaul.