64 Audio tia Fourté, Universal-Fit 4-Driver Hybrid In-Ear Monitor with a Completely Sound Tube Free Design, 1 x tia BA for trebles, 1 x tia BA for mids, 1 x BA for high mids and 1 x dynamic driver for low mids and bass, Frequency-shaping sound chambers in combination with an internal passive radiator create intense basses, smooth mids and a broad sound stage, Innovative Apex technology reduces the pressure on the eardrum through pneumatic interactive ventilation, Closed design, Frequency response: 5 - 22,000 Hz, Sensitivity: 114 DB @ 1,000 Hz @ 1 mW, Impedance: 10 Ohms @ 1,000 Hz, Crossover: Integrated 4-way passive crossover, Isolation: -20 dB via internal apex technology, Cable: 1.2 m (removable), Connection: 3.5 mm mini jack angled, Includes: Transport hardshell case, dehumidifier, cleaning tool, shirt clip, TrueFidelity foam ear tips (S, M, L), silicone ear tips (S, M, L)