Features: Excellent Value for Money Dual power system (Lithium battery + Solar) ensures stable performance while reducing replacement costs 600mAh battery capacity supports long-term operation Replaceable lithium battery for extended product lifespan and lower maintenance Enhanced Comfort Ultra-fast switching time (≤1/10000s ±20%) reduces eye strain during arc transitions Adjustable delay time (0.15–1s) lets you customize comfort based on your welding pace Wide working temperature range (-5°C to +55°C) ensures consistent performance in extreme environments Lightweight & Compatible Compact filter size (133×114×10mm) fits most welding helmets Lightweight design helps reduce head and neck fatigue during extended use Superior Visual Clarity Large viewing area (100×93mm) provides broad, clear visibility for accurate welding DIN4 ±0.5# light state / DIN5~DIN13 ±0.5# dark state ensures smooth transitions and reduced eye fatigue DIN13 UV/IR protection keeps your eyes safe at all times Personalized Adjustment External, stepless shade control makes on-the-fly adjustments quick and easy Stepless sensitivity adjustment + 4-step delay options (0.15/0.2/0.35/0.6–1s) to match various welding conditions Multi-function modes including Weld, Grind, Cut, Low Battery Warning, and Self-Test – ideal for both professionals and DIY users User-Friendly Design 4 arc sensors ensure quick response even in low-amp TIG welding or obstructed arcs Built-in self-test function automatically checks filter status upon start Low battery indicator helps avoid unexpected shutdowns