COOSII Over-Ear Headphones AC01 — Wired 3.5mm Headset

COOSII AC01 are wired over-ear headphones that combine passive noise isolation, a 40mm dynamic driver and an integrated mic with volume controls for comfortable all-day listening and clear calls on 3.5mm devices.

The AC01 headset is a corded, passive-noise-isolating design built for students, commuters and everyday users who want fuller sound without relying on Bluetooth. With spacious, deeply cushioned ear pads and a lightweight foldable frame, these headphones prioritize comfort and portability while offering wide device compatibility through a gold-plated 3.5mm jack. They deliver balanced bass and clear mids from a 40mm DLC dynamic driver, plus on-cable controls for managing calls and audio on most mobile devices.

How well do these headphones reduce background noise?

The AC01 uses a 360° surrounding over-ear construction and oversized ear cushions to block much of the ambient sound, creating a quieter listening environment without active noise cancellation. This passive isolation helps you focus on audio during study sessions or travel.

• Over-ear earmuffs sized 3.54" x 1" for full-ear coverage
• Soft protein-leather and breathable mesh pads seal around the ear
• Manufacturer reports up to ~85% reduction in ambient disruption

What is the sound quality and which driver does it use?

Sound is driven by a 40mm DLC (diamond-like carbon) dynamic driver tuned for balanced bass and clear midrange. The combination gives a natural stereo image suitable for music, videos and voice calls without exaggerated treble or boomy bass.

• 40mm DLC dynamic driver for balanced audio response
• Clear midrange for vocals and dialogue
• Stereo separation suited to gaming, streaming and lessons

Are the controls and microphone compatible with my devices?

The headset includes an in-line microphone and volume buttons that work with most smartphones, tablets and Chromebooks that accept a 3.5mm combined audio/mic plug. Note: some desktop PCs separate mic and headphone jacks and may require an adapter for full microphone or inline-control functionality.

• Built-in mic with wind-noise suppression for clearer calls
• Inline volume and playback controls for quick adjustments
• 3.5mm gold-plated plug for broad compatibility; check device jack type

How comfortable and portable are these headphones for travel?

The AC01 is engineered for long wear: a lightweight TPU headband with a center relief zone plus enlarged, deeply cushioned pads reduce pressure during extended sessions. The foldable frame and compact footprint make it easy to stow in a bag for commuting or flights.

• 1/3 larger ear pads than typical models for better comfort
• Adjustable headband with ergonomic padding for secure fit
• Foldable design and light weight for convenient carry

Who is this for? The COOSII AC01 suits teens (12+) and adults who prefer a dependable wired headset: students studying in noisy spaces, travelers who need passive noise isolation, remote workers who use mobile devices for calls, and gamers seeking clear vocal pickup without the need for Bluetooth. If your device has a combined 3.5mm audio/mic jack, the AC01 offers a cost-effective, comfortable option with reliable sound and practical in-line controls. If you plan to use a desktop PC with separate jacks, plan to add a splitter or adapter to enable microphone and control functions.