64 Audio Duo, In-ear Monitor Headphones, With Apex Core, Tia, LID and Wave Sync technology, 1x Tia high frequency driver, 1x dynamic woofer driver, Open headphone experience with the intimacy of an in-ear monitor, Tia tube-less design reduces resonance for transparent and lifelike sound, Apex Core ventilation system with perforated grille provides less obstructed airflow, LID design for consistent, reliable sound regardless of audio source, Wave Sync System perfectly controls crossover coherence, Construction: Open, Frequency response: 20 - 20000 Hz, Sensitivity: 98dB/mW @1kHz, Impedance: 9 Ohm, Crossover: Integrated 2-way passive crossover, Isolation: -12dB by internal apex technology, 3.5 mm angled mini jack, Incl. premium leather case, TrueFidelity foam earpieces (S,M,L), SpinFit silicone earpieces (S,M,L), silicone earpieces (S,M,L) and black premium cable