For iOS or Android: with the VPA variable phone adapter, you can connect your smartphone to your SWAROVSKI OPTIK binoculars or spotting scope in an instant to enable you to capture those unique moments. It is suitable for smartphones of various sizes and can be adjusted precisely to fit the cell phone camera. Please note that the VPA must be attached using a suitable adapter ring. The appropriate adapter rings for binoculars AR-B and AR-Bs or spotting scopes AR-S are available separately. The Variable Phone Adapter is fully adjustable to your phone and camera, fits phones between 8.9cm and 14cm wide.