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Black and blue over-ear headphones with padded earcups and adjustable headband, 3.5 mm cable with inline volume control

COOSII AC01 Over-Ear Headphones Black/Blue 40mm 3.5mm

SKU CH-YYFH-V4C2B

Over-ear wired headphones with 40 mm drivers, 3.5 mm jack, inline volume control and 85 % noise isolation for all-day comfort

  • Driver size40 mm
  • Frequency range5 Hz-20 kHz
  • Headphone styleOver Ear
  • Impedance32 ohms
  • Signal-to-noise ratio117 decibels
  • Audio sensitivity117 decibels
  • Blocks up to 85% ambient noise with over-ear isolation
  • 40 mm dynamic drivers deliver balanced bass, treble and clear mid-range
  • Adjustable TPU headband and enlarged protein-leather pads fit teens and adults from age 12
  • In-line volume and call controls on the 3.5 mm cable
  • Lightweight foldable design for easy travel and storage

Wired Over-Ear Headphones with 3.5mm Jack

The COOSII AC01 is a wired over-ear headset built for listeners who want passive noise isolation and a simple analogue connection. It suits students, commuters and office workers aged 12 and older who prefer a plug-and-play audio device without batteries or pairing steps. The 3.5mm connector works with smartphones, tablets, laptops and desktop PCs that still provide a headphone socket.

Passive Isolation and Analogue Power Draw

The closed-back design blocks up to 85% of ambient sound through physical seal alone, so no active circuitry or battery is required. The 32 ohm impedance and 117 decibel sensitivity mean the 40mm dynamic drivers reach loud volumes directly from a standard 3.5mm output without extra amplification. Because the headset draws no USB power, it adds zero load to a laptop or phone battery during long sessions.

Inline Controls for Calls and Playback

A built-in push-button module on the cable handles volume adjustment, track skipping and call answer or end functions without touching the connected device. The foldable hinge and adjustable TPU headband reduce the carrying footprint for travel, while the protein leatherette and mesh ear pads stay comfortable during extended wear. No software installation or driver download is needed for any supported platform.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $35.99
Pricier than about 61% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameCOOSII
Product line1
Model nameAC01, sample sku 22370
Part numberSample sku 22370
Product typeOver the Ear
Product colorBlack/Blue
Audio & video
Driver size40 mm
Frequency range5 Hz-20 kHz
Headphone styleOver Ear
Impedance32 ohms
Signal-to-noise ratio117 decibels
Audio sensitivity117 decibels
Wearing styleOver ear
Noise cancellationSound isolation
Mic impedance~3K ohm
Mic frequency response20 Hz-20 kHz
Mic signal-to-noise ratio117 decibels
Mic sensitivity117 decibels
Ports & slots
Connection3.5 mm

Questions about this item

How do I plug in the 3.5 mm jack and what volume-control step do people forget?

Insert the 3.5 mm plug fully into the device socket until it clicks, then use the inline push-button control to set volume before playing audio — many users leave the headphone volume at zero and wonder why there is no sound.

Which parts of the AC01 will wear out first and need replacement?

The protein-leather ear pads and the 3.5 mm cable are the only user-replaceable items; pads compress over time and the wired connection can fray with repeated folding.

At what sound-pressure level does the 117 dB sensitivity limit appear during long sessions?

At 117 dB sensitivity and 32 ohm impedance, the drivers reach high output with very little source power, so sustained listening at maximum volume can exceed safe exposure limits within minutes.

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