Utilizing strong rare-earth magnets built into the adapter, the S1 system creates an incredibly stable platform, requiring only a super thin stainless steel plate adhered to the phone to secure the device to the optic. Simply flip open the S1 cap, connect your device to the magnet with the included MAGVIEW Phone Plate, position the camera and you are ready to film. The design is incredibly durable and multifunctional. When not in use, the S1 shields the eyepiece from dust and precipitation, keeping your glass clean and clear. The MAGVIEW S1 system will streamline the way you capture content on your next hunt. S1 Fits eyepiece sizes 51mm-60mm (2.0in-2.36in).