The Terra Kelvin 2” x 4.25” x 0.32” LCD Welding Filter is a high-quality auto darkening filter designed for welding helmets. It is powered by batteries and manufactured in China. This filter provides a safe and comfortable welding experience by automatically adjusting the shade to protect the user's eyes from the intense light of the welding process. With its sleek design and reliable performance, the Terra Kelvin LCD Welding Filter is a must-have accessory for any welding professional.