64 Audio U6t in ear monitors- 1 Tia High Driver- 1 High-Mid Driver- 2 Mid Drivers- 2 Low Drivers- 6 Drivers Total- 10hz-20hz Frequency Response - 108db/mW Sensitivity - Integrated 4 way passive crossover- 10Ω Nominal Impedance- 20dB Isolation with m20 apex ModuleOnly used a few times. Comes with all original packaging.