Installation in 1/2"UNF20 threaded hole on the top of the housing + nut. Only new style Olympus HotShoe (5 pins+frame) is compatible. TTL-Converter does not need a battery, it is supplied via camera HotShoe interface. Compatible underwater strobes: Inon S-220 / Z-330 / Z-240 / S-2000/ D-200, Sea&Sea YS-D1 / YS-D3 Mark II/ YS-D3 DUO, Retra Pro MAX (including HSS), Marelux APOLLO III V2.0 (including HSS), Marelux APOLLO-S (including HSS).
