Question on EX devices

[xMalphasx]

I understand that EX devices allow you to change in between series of Partner Machinery right? But what does it mean by "Requires +(insert number) Combat"? Is that like B ST or something?

[NDW]

It's talking about the B St (Battle Stats). Looks like you answered your own question. :)

[xMalphasx]

Oh. Ok, Thanks.