It’s a short boom microphone, adding just 5 grams to the overall weight of the headphones. Rode promises “broadcast-grade audio” from the omnidirectional miniature condenser capsule, with a 20Hz-20kHz frequency range and 67dB signal-to-noise ratio. Interestingly, there’s also the promise of decent plosive rejection — the pops that you get from certain letters in words like “p” and “t” — thanks to the shape and positioning of the boom, rather than the more traditional fix of some sort of pop-shield.
It’s designed to plug into the right headphone cup, and like Rode’s headphones cable, the NTH-Mic has a locking plug that holds it in place. That way, even if the cable gets snagged, there’s less likelihood of it being disconnected unexpectedly.