The MAGVIEW SYNC Phone Plate works with the SYNC self-aligning system that aligns your phone with your spotting scope for faster, more accurate digiscoping. The Plate is backward-compatible to work with the original S1 and S1 Mini spotting scope adapters. Not compatible with B1 or B1 XL binocular adapters. Works with MAGVIEW SYNC self-aligning system for better digiscoping Backward-compatible with the original S1 and S1 Mini spotting scope adapters