Inon Z240 How do you remote fire???

I have two Inon Z-240 connected with fibr optic to my subal housing. What do I need to fire these strobes remotely and does any one know where to purchase??

Thanks so much!

I should have read further as this question was allready asked sorry.

Does anyone know where to purchase trigger fish slave sensor??

Thanks

google wetpixel's review and at the end there is a link to the seller.. 120 euros plus shipping