Headphones and headsets: A4Tech HS-21 ComfortFit

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A4Tech HS-21 ComfortFit

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headset, invoices, registration closed, 20-20000 Hz, 32 Ohms, cable 2 m connector 3.5 mm x2, volume control

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General information (A4Tech HS-21 ComfortFit)
Release date on the market	2012
Main (A4Tech HS-21 ComfortFit)
Type	headset
Design	miscellaneous
Acoustic design	closed
Wireless interface
Design features (A4Tech HS-21 ComfortFit)
The number of headphone headset	2 earphone
Foldable design
Cable length	2 m
Surround sound
Plug	3.5 mm x2
Volume control
Specifications (A4Tech HS-21 ComfortFit)
The lower boundary frequent. range	20 Hz
The upper border is frequent. range	20 000 Hz
Nominal impedance	32 Ohm
Sensitivity	97 dB/mW
Detachable cable
The active noise cancellation

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