Question for DIVERS! Help with BCD.

[bcmind]

I'm in the market for a BCD. I saw a deal over the internet and the title said this:

"It does not come with a power inflator or Air 2"

What does that mean? How much does it cost to add a power inflator and/or Air 2?

I don't even know what Air 2 mean. I assume the power inflator is the device, operate by the left hand, that inflat the BCD right?

P.S. The BCD is ScubaPro Classic.

Thanks!