Detail information:

New SUBAL TTL V4 for Nikon is compatible with all SUBAL housings for Nikon cameras. This TTL version supporting following strobes:
• Sea & Sea YS-D1
• Sea & Sea YS-D2
• Sea & Sea YS-250
• Inon Z240
• Inon D-2000
• Inon S-2000
• Ikelite DS161
• Ikelite DS61
• Retra strobes with Hi Sync

SUBAL TTL V4 for Nikon comes with optical LED trigger. SUBAL TTL V4 system uses two CD2032 batteries.