You can use this welding lens easily and conveniently without charging due to the use of solar panel design. With auto darkening/automatic light change function, this welding lens can effectively protect your eyes while welding. It is constructed of LCD material. The length of the product is 108mm and the width is 50mm. The product is suitable for welding machine. Item Name: Welding Lens Material: LCD Style: A: LCD Three-core Dimming Lens, B: Ultra-clear True Color Dimming Lens (Optional) Power Supply Mode: Built-in 1 x Button Battery (Battery Included, Solar Charging) Features: Automatic Light Change, Anti-UV, Solar Powered Size Details: 10.8cm x 5cm/4.25" x 1.97" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Welding Lens