Hi Ladas,
the BD one is a mechanical lever that bolts to your H/L lever and is around $320.00
When you pull it into Low it is attached and automatically locks the CD.
Nothing electrical to bugger up.
Cheers
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The D2a genuine CDL actuator is the best and can be bought either second hand here or new from the UK.
I ordered mine from Discoparts in the UK, but they have not sent it as yet and it's been nearly 6 weeks and i'm thinking now it will never come because they will not return emails or phone calls, i'm thinking they have stopped trading for some reason, so i think i may have too find some other mob to get one.
They are around the $600 to $700 mark now as the price has gone up in the UK, Ashcrofts Engineering sell them.
Baz.