Comments about Aqua Innovative S.M.A.R.T BCD Integrated Safety Signal Tube:

Despite manufacturer specific models [e.g. ScubaPro] no list of BCDs that are compatible with device. Attachment is generic [universal straps with snaps] and non-compatible with many common older style BCs.
Vinyl backing plate is too large, squarish, stiff and clunky, not form fitting. Potential risk of detaching from BC in an entanglement situation due to attachment method. Hands free concept is great, but not worth the inherent risks arising from faulty design.
Instructions for attachment are amateurish.
Per those instructions, I took mine to a dive center for attachment; the tech guy tried to attach but found incompatible components, recommended I send it back. I played with it myself, found the rubber attachment orifice inside was the wrong size. There was no way to attach the universal straps, which appeared to be more suitable for tank attachment.
No website information either on suitable BCs by manufacturers supposedly supported, but there was a note that, yep, it might not fit my [unspecified] BC.
Forget this item unless you know for certain it will fit your particular BC, regardless of manufacturer. Not worth the hassle, and a real potential hazard in some diving situations.