OM SYSTEMOlympus FL-LM3 Replacement Flash for the OM-D E-M5 Mark II

Would it work with panasonic?

Does this work with the olympus pens? like the ep-l3 and epm-1?

Does this work with the EM-5 mark 1

Has anyone used this flash off camera with the omd em5 ii? do you need a trigger unit or can the camera communicate with it on its own? thanks!