Mackie MP-460, In-Ear Headphones, With four balanced armature drivers, 3-Way crossover, Frequency range: 20 - 20,000 Hz, Impedance: 15.5 Ohm, Sensitivity (± 3 dB, 1 mW at 1 kHz): 118 dB, Up to 40 dB attenuation, Detachable MMCX connector, Colour: Transparent, Optional MP-BTA Bluetooth adapter (not included), Includes hard case, gold-plated 3.5 / 6.3 mm jack adapter, additional cable with in-line remote, cleaning cloth and tool, earplugs in 4 different styles with 3 different sizes each