The Aputure INFINIBAR Softbox for PB12 is a lighting accessory designed for use with the Aputure PB12 LED panel. It provides a soft and diffused light output, enhancing the quality of your lighting setup. The softbox helps to create a flattering and even lighting effect, making it suitable for various applications such as photography, videography, and other creative projects. It is recommended to visit the official Aputure website or check the product's documentation for a more detailed description and specific features.