The NiSi P1 Prosories Mobile Phone Filter system is a filters holder and range of filters designed to be used with ALL smart phones. The P1 holder is built tough made from the same aluminum used in our popular V6 system and holds two mobile phone filters. The holder uses a clip-on system for rapid mounting and can be used on rear or front-facing mobile cameras. The P1 holder can be rotated 360 degrees when easily changing between portrait and landscape orientation. Find out more about the NiSi P1 System.