What does a 3% fee min $10 applies to all balance transfers mean?

Hello there, could you please explain what exactly does the phrase "a 3% fee min $10 applies to all balance transfers" mean? I'm a bit confused about how this fee is calculated and applied. Specifically, I'd like to know if this fee is charged every time I make a balance transfer, and whether the minimum of $10 is a fixed amount regardless of the transfer amount. Additionally, I'd appreciate it if you could clarify if this fee is charged on top of the transferred balance or if it's a separate charge. Thank you for your help!