Shure KSE1500 Electrostatic Earphone System The first application of electrostatic technology for Sound Isolating Earphones (patent pending) featuring a single MicroDriver design Extremely high correlation to the source audio provides unmatched audio clarity and detail. Frequency Response 10 Hz to 50 kHz 4-band parametric EQ features five preset settings and four customizable settings to manage audio playback preferences Integrated USB-rechargeable battery can conveniently charge from provided wall charger or computer, even when streaming USB audio from computer Lightweight, ergonomic earphone shape minimizes ear fatigue while comfortable Sound Isolating sleeves block up to 37 dB of ambient noise Custom-designed earphone cable specifically isolates each conductor Streamlined controls for quick and simple, user-friendly navigation throughout the KSE1500 settings Compatible with Mac, PC, iOS and Android devices via included accessory assortment, featuring Micro-B to Lightning and Micro-B OTG cables Premium Shure fit and finish and construction featuring an elegantly machined black aluminum housing, manufactured to exacting Shure quality standards Includes KSE1500 Electrostatic Earphone System, USB wall charger, Micro-B-to-Lightning cable, Micro-B OTG Cable, (2) 1/8" (3.5mm) cables [6" (15.2 cm) and 36" (92 cm)], " (6.3mm) adapter, leather carrying case, airline adapter, attenuator, cable clip, (2) security bands, microfiber cleaning cloth