Optoelectronic TTL-Converter for SONY A7-A9 cameras for ISOTTA underwater housings.Compatible underwater strobes: Inon Z-330 / Z-240, Sea&Sea YS-D1 / YS-D2 (China) / YS-250, Ikelite DS16 /, DS160, Subtronic Pro-270 / Pro-160, Retra Pro (including HSS).