Headphones and headsets: Etymotic ER•4 MicroPro Earphones

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Etymotic ER•4 MicroPro Earphones

headphones, in-ear, registration closed, 20-16000 Hz, 27 Ohm, cable 1.5 m, connector 3.5 mm and 6.3 mm

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Main (Etymotic ER•4 MicroPro Earphones)
Type	headphones
Design	ear
Acoustic design	closed
Wireless interface
Design features (Etymotic ER•4 MicroPro Earphones)
Cable length	1.5 m
Plug	3.5mm i 6.3mm
Volume control
Specifications (Etymotic ER•4 MicroPro Earphones)
The lower boundary frequent. range	20 Hz
The upper border is frequent. range	16 000 Hz
Nominal impedance	27 Ohm
The active noise cancellation

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