I think the mask isn't necessarily a power duplicator, but it CAN be, if the situation calls for it. In this case, if it's dark and a situation where Daredevil would be at an advantage due to his radar sense, then he gets radar sense as well, to even the playing field. But in another instance he may get toughened skin or regenerative abilities if facing off against someone with swords or something. Whatever it takes to make the fight even.