HSS Optoelectronic TTL-Converter for ISOTTA underwater housings for Canon cameras, including 5Dm4, 5DSr,....7Dm2 support. All Canon cameras are compatible, independently of TTL protocol version. Supported strobes: Inon Z-240, Z-330; Ikelite DS-161, DS-160; Sea&Sea YS-250, YS-D1, YS-D2 (made-in-China). Product supports Retra HSS up to 1/8000. Product supports 4 pcs TTL outputs: 2 pcs optical bulkheads + 2 pcs electric bulkheads can be connected. TTL-Converter has automatic switch On/Off, Incredible battery life 5 years. Easy installation by user.