COOSII AC01

The COOSII AC01 is a budget wired over-ear headphone that delivers decent sound and comfort for around $27 USD. It's great for studying and casual listening on phones and tablets, but the mic and volume controls don't work on PC without an adapter. Skip it if you need wireless or PC call support.

The AC01 uses a 40mm dynamic driver with a 32Ω impedance, which means it's easy to drive from just about anything with a headphone jack. Volume gets plenty loud on phones and tablets. Sound quality lands around the 66th percentile in our database, so it's solidly average. Bass and treble are well balanced, and the midrange is clear enough for voices and video calls. Don't expect audiophile detail, but for $27, it's respectable.

The passive noise isolation is the real highlight. COOSII claims up to 85% ambient sound reduction, and while we can't verify that exact number, the thick protein leather pads do a good job of sealing out background chatter. It's not active noise cancelling, but it's better than most cheap wired headphones. The mic is fine for calls, though it's the weakest area of the whole package, scoring just 35.5 out of 100 in our calls testing.

Compared to the JBL Tune 670NC, the AC01 loses on features. The JBL has Bluetooth, active noise cancelling, and a more premium build. But the JBL costs several times more. The Soundcore Life Q20 is a closer competitor in spirit, offering wireless convenience and better battery life, but it's still pricier. The TOZO HT3 and Truefree HF-10 are also wireless budget options that beat the AC01 on connectivity and features.

Where the AC01 holds its own is simplicity and price. If you don't want to charge headphones or deal with Bluetooth pairing, a wired option like this is actually refreshing. The Sony WH-CH720N is a much better headphone overall, but it's also in a completely different price class. For a Chromebook or school-issued laptop, the AC01 is a practical choice.

At $27 USD, the COOSII AC01 is hard to beat if you just need a wired headphone that works. The JBL Tune 670NC and Sony WH-CH720N both cost significantly more and add Bluetooth and ANC, but if you're on a strict budget or buying for a kid who loses things, the AC01 makes sense. The Soundcore Life Q20 is another wireless alternative with better build quality, but again, you're paying more. For a simple wired option, the AC01 delivers acceptable sound and comfort without breaking the bank.

The COOSII AC01 is a wired over-ear headphone that sits firmly in the budget bracket, usually around $27 USD. It's aimed at students, kids, and anyone who just needs a simple pair of cans for a Chromebook, tablet, or phone with a 3.5mm jack. No Bluetooth, no app, no charging case. Just a cord and a promise of decent sound for not much money.

So is the COOSII AC01 good for studying or casual listening? For the price, mostly yes. The 40mm dynamic drivers push out a balanced sound that's perfectly fine for lectures, YouTube, and Spotify. The over-ear design with thick pads blocks a decent chunk of ambient noise, which helps in a dorm or busy kitchen. But this is not a premium headphone, and the build quality reflects that.

One thing to know right away: the inline volume controls and mic don't work on PC. You'll need a separate adapter if you want to use the mic on a computer. That's a real limitation for a headphone marketed toward students using laptops and desktops.

Skip the COOSII AC01 if you need a headset for PC calls or gaming. The mic and volume controls require a separate adapter on computers, which is a hassle. Also skip it if you want wireless freedom or active noise cancelling. The JBL Tune 670NC or Soundcore Life Q20 are better picks for those needs. And if you're rough on gear, the plasticky build might not last.

Should you buy the COOSII AC01? If you need a cheap, comfortable wired headphone for studying, casual music, or kids, yes. It's not fancy, but it does the job. The sound is decent, the pads are comfy, and the passive isolation helps in noisy environments.

But if you need a mic for PC calls or want wireless freedom, look elsewhere. The PC compatibility issue is a real annoyance, and the build quality won't survive rough handling. For the price, though, it's a solid backup pair or a first headphone for a student.