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Built to the same exacting standards as all Elite Series monitors, the ES1 off ers Westone performance and sound at a lower price. The ES1 provides unexpectedly high sound quality from a single driver and 25dB of ambient noise reduction. Ear impressions are required to order all Westone Custom products. To order please click on the Find A Dealer button above to find a preferred Westone audiologist who can take and complete your custom order. Features Replaceable cable one year parts and labor warranty on internal components 25 dB average acoustic separation Technical Specifications Sensitivity: 114dB @ 1mW Frequency response: 20 Hz - 16 kHz Impedance: 25 ohms @ 1kHz Driver: Balanced armature Cable: Westone EPIC removable cable