64 Audio U12t, Audiophile in-ear monitor with 12 driversThe combination of tia technology single-bore design (""one opening"") with 4 balanced armature woofers, 6 BA mid-range drivers, a BA mid-range tweeter and the open tia tweeter BA creates a lively and three-dimensional sound. Innovative@+@+Modular apex technology reduces the pressure on the eardrum through pneumatic interactive ventilation. LID technology maintains its sound signature regardless of the source@+@+, Closed construction, Frequency range: 10 - 20,000 Hz, Sensitivity: 108 dB / mW @ 1,000 Hz, Impedance: 10 Ohm (+ 1 / -2 10 - 20,000 Hz), Crossover: Integrated 4-way passive crossover, Isolation: -20 dB and -15 dB thanks to the included apex modules, Cable: 1.2 m (detachable), Connection: 3.5 mm mini jack, angled, Scope of delivery: transport hard case, dehumidifier, cleaning tool, shirt clip, TrueFidelity foam eartips (S, M, L), silicone eartips (S, M, L), m20 apex module and m15 apex module