The "MSI USB MSI Power A100" likely refers to an MSI 100W USB-C Power Adapter (Model A100 or similar), designed for modern MSI laptops like the Prestige series, offering USB Power Delivery (PD) for charging and powering devices via a USB-C port, often replacing larger traditional chargers. It provides versatile outputs (e.g., 5V/3A up to 20V/5A for 100W) and is a portable, universal charging solution, though higher-wattage gaming laptops might need more power.