From the manufacturer website:

"The VIKING 3350 ADV Series takes our proven, premium auto-darkening helmet series to a new level, pairing the exclusive 4C optics and X6 Headgear - now also featuring advanced digital controls, modular work-piece illumination, auto-shade technology, Bluetooth connectivity and more! It sets a new standard for the functionality and capabilities for a professionals' welding helmet."

Link below for full description.

https://www.lincolnelectric.com/en/Products/k3034-5