PAPR system offers the welder compact, lightweight respiratory protection and quality filter optics all-in-one. Thanks to improved optics, the 9100XXi ADF allows you to more readily recognize colors as compared to our other models. Grab and go with auto-on. An improved user interface that is easy to understand. The 3M Speedglas Silver Front Panel 9100XXi houses external controls, enabling fast and easy access to the grinding and memory modes. 3M Speedglas Auto Darkening Filter 9100XXi offers a 2.8" x 4.2" viewing area.