X man and Spanner Skull are upgrade version, fully automatic without any button. Features: Suitable for all welding Applications: ARC, MMA, MAG, TIG & Plasma Cutting Fully Automatic Darkening Welding Helmet Lightweight, durable, corrosion & flame retardant Double arc sensors Utilizes high performance solar cells w/ built-in 3V lithium batteries(CR2032) as power back up Super Fast Darkening Speed: 1/25,000 Second Fully automatic power On/Off External variable shade control Sensitivity control by variable dial (low-high) UV/IR protection Certified CE/EMC, GS & ANSI (Z87.1) Complies standards & ANSI Z87, 1-2003 standards Specifications: DIN Range: DIN9-DIN13 Viewing Windows: 92.5 x 42.5mm Response Time: 0.0002MS Retention time: 0.4ms~0.8ms UV/IR protection: DIN 15 Power Supply: Solar with Lithium Backup Operation temperature: -5 ~ 55C Package Includes: 1 x Auto Darkening Solar Power Welding Helmet