B.P.R.D. Signal Device (EHB-019C)
Equipment, 0
Concealed—Optional <p> Equipped character gets +1 DEF. <p> Pay 1 endurance >>> Equipped character can't be the target of effects your opponents control this turn.


what happen if the equip is ko ed ??? are they still un targetable if the pay 1

If you It's ko'd before its activated than yes they can be targeted. If you ko it after they use it the effect is still legal till the end of turn.

thank you big help