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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-22 · 7 min read · Independent comparison
• CMF BY NOTHING Buds 2 — biggest strength: 55 hours of total playtime and a 48dB hybrid ANC rating, in a plastic-bodied in-ear design with 6 HD mics and ChatGPT integration.
• CMF BY NOTHING Buds 2 — biggest trade-off: Its connectivity and codec story is basic Bluetooth with no lossless or hi-res codec support listed, and the 5200Hz frequency figure describes the ANC range rather than a rich audio spec sheet.
• EarFun Air Pro 4 — biggest strength: A dual-driver hybrid system (10mm dynamic plus balanced armature), Qualcomm Snapdragon Sound with aptX Lossless, LDAC, LE Audio and LC3, plus adaptive ANC rated up to 50dB.
• EarFun Air Pro 4 — biggest trade-off: EarFun's data sheet is thin on battery life and durability details, and the feature set is clearly aimed at listeners who care about codecs and call clarity rather than marathon runtime.
• Who each pick is for: CMF BY NOTHING Buds 2 for the listener who wants long stretches between charges, a bold look, and a simple touch-control experience. EarFun Air Pro 4 for the listener who wants the best possible wireless audio quality and smarter noise cancelling.
The CMF BY NOTHING Buds 2 is built around two headline numbers, and both are about endurance and quiet. The first is 55 hours of playtime — that is the total figure with the charging case in the equation, and it is the kind of number that matters if you are the person who charges earbuds once a week and forgets where the cable went. The second is 48dB of hybrid active noise cancellation across a 5200Hz frequency range. Hybrid means the system uses microphones on both the outside and inside of the earbud, which is the more effective approach to cancelling steady environmental noise than a single-mic setup.
In my opinion, you should buy the CMF BY NOTHING Buds 2 if your priorities are battery life, a strong ANC figure, and a fun, modern look — and you mostly stream from a phone without chasing lossless audio. You should skip it if you own a hi-res music player, care about aptX or LDAC, or want a more advanced driver architecture. It is also worth noting that the data sheet does not spell out water resistance or a companion app feature list, so if either of those is a dealbreaker for you, treat that as a gap rather than a feature.
EarFun Air Pro 4: Who It's For
The EarFun Air Pro 4 is aimed at a different buyer entirely: someone who treats their earbuds as an audio product first. The centerpiece is a hybrid driver system that pairs a 10mm composite dynamic driver with a balanced armature driver, aligned at 11 degrees to reduce high-frequency attenuation. In plain terms, that combination is designed to give you the punch of a dynamic driver in the low end plus the detail and clarity a balanced armature is known for in the mids and treble. EarFun describes the result as robust bass, an articulate midrange and sparkling treble.
Then there is the codec story, which is where this product separates itself most clearly. It runs Qualcomm's QCC3091 system-on-chip with Snapdragon Sound certification, aptX Lossless, Hi-Res Audio support, plus LDAC, LE Audio and LC3. If you have a phone or source device that supports any of those, you are getting a higher-bandwidth, higher-fidelity wireless path than plain Bluetooth. That is a real, functional difference in the design — not marketing decoration.
Noise cancelling is adaptive rather than fixed: the system automatically detects your ear canal shape to maximize performance, rated up to 50dB, and it is built on EarFun's QuietSmart 3.0 platform. For calls, you get a 6-mic array with AI beamforming and Qualcomm cVc 8.0, which focuses the pickup on your voice and suppresses background noise. In my opinion, that makes the Air Pro 4 the better pick for anyone who takes a lot of calls in noisy places — open offices, streets, transit.
Side-by-Side: Which Should You Choose?
• Best for battery life → CMF BY NOTHING Buds 2. 55 hours of total playtime is the only battery figure in this comparison, and it is the headline reason to pick it.
• Best for audio quality → EarFun Air Pro 4. A 10mm dynamic driver plus a balanced armature, with aptX Lossless, LDAC, LE Audio and LC3, is a clearly more capable audio pipeline.
• Best for noise cancelling specs → EarFun Air Pro 4, narrowly. Adaptive ANC rated up to 50dB versus the CMF's 48dB hybrid system. The gap is small in numbers, but adaptive detection of your ear canal shape is a meaningful design difference.
• Best for call clarity → EarFun Air Pro 4. 6 mics with AI beamforming and Qualcomm cVc 8.0 is a more detailed voice-processing setup on paper than the CMF's 6 HD mics alone.
• Best for a bold, simple design → CMF BY NOTHING Buds 2. In-ear shape, plastic body and case, touch controls, and an orange colorway that stands out.
• Best for hi-res source devices → EarFun Air Pro 4. If you own a phone or player with Snapdragon Sound, LDAC or LE Audio support, the CMF buds' plain Bluetooth connection leaves that hardware sitting idle.
• Best for assistant features → CMF BY NOTHING Buds 2. ChatGPT integration is listed as a feature here, and nothing comparable appears in the EarFun data sheet.
• Best for a low-fuss, marathon-listening setup → CMF BY NOTHING Buds 2. Fewer things to configure, longer between charges, one clear job done well.
If I were buying one of these for myself, I would take the EarFun Air Pro 4. The reason is simple: the hybrid dual-driver system, Snapdragon Sound with aptX Lossless, LDAC, LE Audio and LC3, and the adaptive ANC with 6-mic AI beamforming are the features that actually change how music and calls sound day to day. The CMF BY NOTHING Buds 2 wins on stamina and style, and 55 hours is genuinely appealing — but for me, audio quality and smarter noise cancelling outweigh a longer charge cycle. If battery life is your number one, flip that decision.
The CMF BY NOTHING Buds 2 is the one with a published figure: 55 hours of playtime. EarFun's data sheet does not list a battery number for the Air Pro 4, so you cannot make a like-for-like comparison. If runtime matters most, the CMF pick is the safer choice.
On design and specs, yes — it uses a hybrid dual-driver setup with a 10mm dynamic driver and a balanced armature, and supports aptX Lossless, LDAC, LE Audio and LC3. The CMF buds rely on a dynamic driver over standard Bluetooth. Whether you hear the difference depends on your source device.
The EarFun Air Pro 4 is rated up to 50dB with adaptive ANC that detects your ear canal shape. The CMF BY NOTHING Buds 2 is rated 48dB with a hybrid system covering a 5200Hz frequency range. The numbers are close; adaptive tuning is the more advanced approach in my view.
Yes — these two sit in different value tiers depending on the day, and neither figure is something I quote here. Check the current price on Amazon for both before you commit, and weigh that against which feature set you actually need.
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