The headgear is comfortable to wear. Based on the ergonomic design, the headband can be adjusted by different sizes. It will make the wearer feel more comfortable; • Better shape, new headband design, close to the shape of the wearer's head, so that the wearer can move freely; • When use with face shield , it's convenient, which is made of PC material, with excellent impact protection performance and wide protection area; • Excellent airflow distribution and lower noise; • It is suitable for welding, slag treatment, metal cutting and other grinding to protect eyes from splashing of chemical liquid, pesticide, paint and so on; • The PAPR is applicable with welding helmet, hood , or face shield to use; SPECIFICATION Viewing Area 108x78mm Cartridge Size 133x130x20mm Arc Sensor 4 UV/IR Protection UP to shade DIN 16 at all times Light State DIN 4 (Grind) Dark State Internal,Varible shade 5~8/9~13 Sensitivity Control adjustable by touch switch Switch Time 1/30,000S, from Light to Dark Delay Control 0.1-1.0S from low to high Power Supply 2*CR2450 and Solar battery TIG AMP Rating DC=5, AC=5 Operating Temperature -5°C to +55°C Storing Temperature -20°C to +70°C Other Functions Low Voltage Indicator Standard Air Filter Filter classes: TH3P R SL Operation Temperature Low Speed: Great than 6 CFM (170 LPM) minimum High Speed: 7.06 CFM (200 LPM ) Storage Temperature -5°C to +55°C Blower unit shelf life -20°C to +55°C Filter shelf life 1 year Battery Type 3 years Battery Charging Time Rechargeable Lithium Battery Life About 3 Hours Run Time: 500 Charges- Run Time Dependent On Air Flow Rate Low Speed/High Speed Approximately 4-6/6-8 hours