Thinksound ms 01 in-ear monitor features an acoustically enhanced, 8mm high-definition driver with passive noise isolation. It was voiced by critically acclaimed Audio Engineer & thinksound CEO, Aaron Fournier, & designed in collaboration with Grammy-winning musicians & producers. The result is a headphone with fine resolution of detail, easy highs, clear mids, & bold, robust bass. The ms 01 boasts advanced studio acoustics & a full range sound that delivers exactly what pros & discerning listeners dem&.