GreggS - 4/16/2018 2:19 PM
After a little more research, I found the following info...

Oceanic, Aqua Lung, Sherwood, and Shearwater transmitters, along with discontinued or defunct brands Aeris, Hollis, and Tusa, are all manufactured by the Pelagic Pressure Systems (now owned by Aqua Lung), and marked on the end battery cap with FCC ID MH8A. Since they use the same transmitter technology, the are interchangable between all these brands.

Suunto, Scubapro, Mares, Ratio, Heinrichs Weikamp, and discontinued Liquivison transmitters are proprietary and will only work within their own brand.

Hopes this helps.