As a quick check
If you have a small red led on the front of the shocker then chances are is a ds board
if to you have a small green led on the side (if i remember) then its an Ls
the only real way to tell is to open the shocker up, and check the inside. Inside look where the trigger hits the board (you may have to undo the board from the base if it has a small black button switch its a DS , if it has a small metal lever switch its an LS
HTH
bruce