I've got a pair of those
they lasted nearly a year before the wires broke
I soldered a new section of wire in but forgot to pull the battery before fucking with it, musta killed something because the main chip on the board gets smoky hot when I plug a charged battery into the board :/
protip, the ear donut pads snap off then there's torx screws inside the cups, don't just try and pry the back sides off like the gorilla that I am
they also don't seem to damp sound as well as proper muffs, and the audio quality kinda sucks in the way that all headphones suck (the bass overrides the mid and high ranges)
I'd buy another pair if they were $20 on sale again.
Reading the thread now to see what kinda options there are nowadays