This power box is a high-capacity, high-safety, multi-voltage output lithium battery pack newly developed by Gaoqing Lingfeng Mai Technology Co., Ltd. based on customer needs. Fully charged, it ensures extended continuous use; it is suitable for use with meters and excitation devices in field operations, and can also meet other civilian needs; it's convenient to carry, boasts ultra-high capacity, and is safe to use. Choosing this battery pack will be a satisfying decision for you.