UW Technics TTL converter for Seafrogs housing for Sony a7iv

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Just like the title says this is a UW technics TTL converter for the Sony a7iv and a7c. It’s made for Seafrogs housings but I’m willing to bet it would work in other ones. The LEDs that control the flash are plug and play so you could probably get different ones if you need them to fit your housing. It’s in nearly unused condition. It has never been taken more than 20 feet down. I had some issues with the housing and my camera and decided to go a totally different direction. UW technics does not take returns so I’m trying to sell the converter, they retail for $520. Any reasonable offer and it’s yours.