This seems to be not a common thing and is not (only 2 years after the release) currently listed on Centrance’s site (https://centrance.com). It can still be found a few sites, like Amazon (https://www.amazon.com/CEntrance-BlueDAC-Balanced-Bluetooth-Headphone/dp/B07F3MB7JJ) with scant information.

Is it expected or probable that an IEM/headphone could become damaged by connecting it to a ‘normal’ headphone output at full volume? Does this / how does this vary by kind of transducer? An underlying question might then be, do transducers (and if so, how does it vary) have intrinsic defenses...