Looks like a Godox AR400 re-branded Tel, I've got the Godox and find it extremely useful both indoors and out, on 1/4 power at ISO200 I get roughly f/8 in the studio, outdoors it varies on the conditions but I still manage around 600 full power pops on a fresh battery.
Weight wise not too bad I use it with a gripped XT1 & zoom and can hold all day.