Lights and a filter.
I have the Gobe package. Very nice tray and lights.
Filter, The Flip 3.1 is great IMO. Don't know if it fits the Hero 4 or not. I also have the macromate. Still working on getting things right with it.
Oh, and one more thing, extra batteries and a charger.
Light & Motion GoBe L.E.D. Action Camera Kit 856-0520 with reviews at scuba.com
Flip Filters FLIP3.1 Macromate Mini Combo Package BS-FLIP31-MMC
I have the Gobe package. Very nice tray and lights.
Filter, The Flip 3.1 is great IMO. Don't know if it fits the Hero 4 or not. I also have the macromate. Still working on getting things right with it.
Oh, and one more thing, extra batteries and a charger.
Light & Motion GoBe L.E.D. Action Camera Kit 856-0520 with reviews at scuba.com
Flip Filters FLIP3.1 Macromate Mini Combo Package BS-FLIP31-MMC