Two Hi Def DriversSensitivity: 109 dB SPL/mW. Frequency Range: 20 Hz –19 kHz. Speaker Type: Dual High-Definition. Impedance: 20 Ω. Additional specifications are available in the user guide. | Sound IsolationComfortable sound isolating sleeves block up to 37 dB of ambient noise. Sound isolation technology prevents outside noise from interfering with your listening experience, whether onstage or on-the-go. Shure Sound Isolating Earphones require a proper fit to achieve the best sound. | Detachable CableDetachable cable system enables multiple connectivity options for long-term device compatibility, upgrades, and ease of maintenance. See below for four different connectivity options, including Bluetooth, Lightning, USB-C, and Universal 3.5 mm. |