Provides a nice way of calibrating and controlling the monitors. With purely digital audio at 0db, the optional volume control it makes it convenient to keep full dynamic range until the very last step.
The unit is housed in a light, flimsy feeling plastic case, and has two 3.5 mm TRS jacks.
The included calibration microphone and optional volume knobs come with thin wires and 3.55 TRS jacks.
The case, wires and connectors do not inspire confidence that everything will hold up for years to come, which, considering the price, they really ought to.
The microphone holder supports two sizes of rods, it' would have been be nice if they'd have included an adapter to fit it on camera tripods (1/4" thread) just in case.
Technically, it performs great, and it is convenient and easy to use, but I wish the build quality of the box and connectors had been more solid.