Electronics
Most headphone disappointment is a fit problem, not a sound problem. After that, it's codec support and how honestly the noise cancellation is described.
A few questions about your situation, not about the product.
Answer all 3 questions to see the spec sheet to shop with.
The speaker inside: dynamic, balanced armature, or planar.
Why it matters
Dynamic drivers give bass weight; larger isn't automatically better, tuning matters more.
What to check
Huge driver numbers on cheap earbuds usually mean boomy, muddy bass.
How audio is compressed before it flies to your ears.
Why it matters
Your phone and headphones must both support a codec for it to be used at all.
What to check
LDAC on the box is useless if your phone only sends AAC.
Microphones cancel steady low-frequency noise like engines and fans.
Why it matters
It transforms flights and commutes; it does very little against speech.
What to check
'ENC' is microphone noise reduction for calls — it does nothing for what you hear.
How hard the headphone is to drive.
Why it matters
High-impedance wired headphones sound thin from a phone and need an amp.
What to check
Anything over ~80 ohms should be paired with a DAC/amp, budget for it.
Hours per charge, with and without ANC, plus the case's extra charges.
Why it matters
Advertised figures are almost always ANC off at 50% volume.
What to check
Earbud batteries degrade in 2–3 years and are not replaceable.
Ear tips, clamping force, and sweat/water resistance.
Why it matters
A bad seal loses all the bass and most of the ANC. Fit is the single biggest variable.
What to check
For gym use, IPX4 minimum; for over-ears, check clamp pressure with glasses on.
Audio delay for video/gaming, and connecting to two devices at once.
Why it matters
Above ~150 ms lip sync is visibly off; multipoint saves constant re-pairing.
What to check
'Game mode' cuts latency but usually shortens battery and range.
Typical range: honest budget wired pairs to premium ANC over-ears.
