Weltek Navitek Vision S4 Airfed Auto Darkening Welding/Grinding headshield comes in a handy tote bag, excellent for carrying and storing. The shield features a viewing area of 93 x 43mm and variable shades DIN 9 to 13 and so is perfect for all welding jobs. It also features a flip up visor assembly for grinding mode. The Airkos Blower Unit has 2 airflow speeds of 180 and 220 litres per minute. There is a filter alarm incorporated (both audible and visual) to alert if there is clogging. The blower unit has a rechargeable 4 cell lithium-ion battery that gives up to 10 hours running time.