Features The highly sensitive arc sensor and probe of this product provide professional and accurate protection. This welding argon arc welding solar energy automatic charging, without the use of power, is practical and environmentally friendly. The welding helmet lens has a clear window and a wide field of watching, which can quickly and reliably filter out welding arc light. This welding lens set is easy and safe to operate, and it can be used with different styles of welding masks. Using this welder mirror group can be well protected at work to prevent occupational diseases. Feature: 1. The highly sensitive arc sensor and probe of this product provide professional and accurate protection. 2. This welding argon arc welding solar energy automatic charging, without the use of power, is practical and environmentally friendly. 3. The welding helmet lens has a clear window and a wide field of watching, which can quickly and reliably filter out welding arc light. 4. This welding lens set is easy and safe to operate, and it can be used with different styles of welding masks. 5. Using this welder mirror group can be well protected at work to prevent occupational diseases. Specification: Item Type: Welding Lens Bright State Color Number Grade: DIN4 Dark State Color Number Grade: DIN9～13 Dark State Color Number Adjustment Method: Internal control, stepless adjustable Dimming Response Time: 1/10000S Induction Sensitivity Control Adjustment: Steplessly adjustable Recovery Time: 0.1S~0.8S Power Supply: Lithium battery/solar Built-in Battery Model: CR2450 Number of Batteries: 2 (not included) Rated Capacity of Lithium Battery: 1200MAh Whether The Battery Can Be Replaced: Yes Working Temperature: -10℃～65℃ Number of Arc Sensors: 4 Infrared/Ultraviolet Protection Class: DIN15 Self-Check Function: Yes Low Voltage Alarm Function: Yes Polishing Function: Yes Cutting Function: Yes Size: Approx. 60mm / 2.4in                     100mm / 3.9in Package List: 1 x Dimming Plate Package List 1 x Dimming Plate