The wireless trigger is Godox XT2 -.it can control a bunch of godox flash units at once. Very handy. It's a Nikon version unit. You can adjust the output of each flash unit from the trigger on the hot shoe of the camera. $30 firm
Also -TT600 godox flash units 1 for $40 --- 2 for $70 They are manual flashes - not auto TTL -model is Godox TT600. Work on any camera or in a studio with umbrellas, etc. Work on 4 AAs. You set the power manually or use a wireless trigger to set from there. They have a built in optical trigger too of course
Nothing has been used much - mostly sitting in my drawer!