What's it do over the regular one?
Well you have 3 Medikit's all over in this mod.
The first one is avaible from the start, but is heavier, has only 3 uses, gives only 1 HP per fatal wound and costs more TU to use.
The second one has the stats of the original medikit, but with a recolored sprite and only 6 uses.
The last one does double healing per fatal wound compared to the original one, takes less TU to use and has more uses.
You need to research snakeman and chryssalid corpses first to the normal medikit and then Muton and their terrorunit corpses to get the advanced one.