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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a do-everything TV and stereo audio hub with a true audiophile DAC and serious long-range Bluetooth, choose 1Mii B03Pro; if you need a compact wired headphone amp bundled with a pair of HiFi earphones, choose HiBy W3.
• 1Mii B03Pro — biggest strength: It works both ways. It can transmit audio from a non-Bluetooth TV to your headphones, or receive Bluetooth from your phone and push it into a stereo. Add a built-in SABRE DAC, dual antennas and aptX HD/Adaptive/Low Latency, and it covers almost every home audio job.
• 1Mii B03Pro — biggest trade-off: It is a corded, desktop-style box that needs power and a place to sit. It is not something you pocket, and it cannot run transmit and receive at the same time.
• HiBy W3 — biggest strength: It is a focused, pocketable headphone amp paired with HiBy's own Yves HiFi earphones. One box, one job: better sound from a wired setup.
• HiBy W3 — biggest trade-off: Its feature set is narrow. There is no TV transmitter mode, no optical or RCA pipeline, no dual-headphone streaming. It does its one job and nothing else.
• Who each pick is for: 1Mii B03Pro is for the person untangling a TV, soundbar, stereo and headphone mess in one room. HiBy W3 is for the person who just wants cleaner sound out of wired earphones.
The 1Mii B03Pro is a Bluetooth transmitter and receiver, and that dual identity is the whole point. In transmit mode it takes audio from a TV, stereo or any source with Optical, RCA, 3.5mm AUX or Bluetooth input and sends it wirelessly to Bluetooth headphones or speakers. In receiver mode it does the reverse: your phone or tablet streams to the B03Pro, which feeds a wired stereo, speaker set or car radio. There is also a bypass mode, so a wired speaker can stay hooked up while wireless headphones do their thing.
The audio side is where 1Mii clearly spent its budget. A built-in SABRE DAC is paired with a Qualcomm chip, and 1Mii rates the signal-to-noise ratio at 121dB. In plain terms, that is a very quiet noise floor — the kind of spec you want if you listen to lossless files and care about detail rather than just "it works." Codec support runs aptX HD, aptX Adaptive and aptX Low Latency, with Bluetooth 5.3 as the radio. Two important caveats from the spec sheet: your headphones or speakers must support the matching codec to get aptX benefits, and connecting two aptX LL headphones drops the link to plain aptX for stability.
Range is the other headline. Class 1 Bluetooth plus dual antennas gives up to 265 ft line-of-sight outdoors and roughly 80–110 ft indoors. That is enough to walk to the kitchen or the garage without the signal falling apart, though walls, metal and Wi-Fi congestion will chip away at it.
Buy it if you want one box to handle TV-to-headphones, phone-to-stereo and dual-headphone listening in the same room. Skip it if you need something portable, or if you only ever listen from a phone into wired earphones — you would be paying for modes you never use. It is corded electric, 106 g, and a compact 3.8" x 2.9" x 0.9" ABS box, so it lives on a shelf rather than in a pocket. Setup is plug-and-play with automatic device detection, and there is a physical volume control plus push-button mode switching. One more spec-sheet note: in transmit mode over optical, set your TV's audio output to PCM. It arrives with AUX, RCA-to-3.5mm, optical and USB power cables in the box and a 12-month warranty.
HiBy W3 is a different animal entirely. The listing describes it as a headphone amp bundled with HiBy's Yves HiFi earphones — a two-part kit rather than a home-audio hub. If your setup is a phone, a laptop or a portable player feeding wired earphones, this is the kind of product that sits between them.
That is a genuinely useful niche. Wired earphones plugged straight into a phone often sound thin because the phone's own output stage is the weak link. A dedicated headphone amp exists to fix exactly that: more headroom, a cleaner signal path, and a more controlled low end. Bundling the Yves earphones means you do not have to already own a good pair to get started — you get the amp and a matching set of earphones in one purchase.
What you should not expect is flexibility. There is no optical input, no RCA, no TV transmitter mode, no dual-device streaming, no long-range antenna array. The spec sheet lists it as available since March 17, 2025, and that is essentially the whole story: a small, current-generation personal listening kit. It is not trying to be a living-room adapter, and it would be a poor substitute for one.
Buy it if your listening happens on the move or at a desk, through wired earphones, and you want the amp and the earphones sorted in one go. Skip it if your actual problem is getting audio from a TV or stereo to wireless headphones — that is a job the W3 was simply not designed for.
• Best for TV-to-headphone listening → 1Mii B03Pro. Optical, AUX and RCA inputs plus aptX Low Latency are built for exactly this.
• Best for turning an old stereo into a Bluetooth speaker → 1Mii B03Pro. Receiver mode handles phone-to-stereo streaming.
• Best for two people watching one TV → 1Mii B03Pro. Dual-link pairs two Bluetooth headphones or speakers at once.
• Best for range → 1Mii B03Pro. Up to 265 ft line-of-sight and 80–110 ft indoors, thanks to Class 1 Bluetooth and dual antennas.
• Best for sound quality from lossless files → 1Mii B03Pro. The SABRE DAC and its 121dB signal-to-noise ratio are the reason to pick it.
• Best for portable wired listening → HiBy W3. A pocketable amp plus earphones beats a corded desktop box you cannot carry.
• Best for a first headphone amp setup → HiBy W3. The amp-and-earphones bundle means no extra purchase to get going.
• Best for a single-purpose, uncluttered kit → HiBy W3. One job, no modes to remember.
In my opinion the 1Mii B03Pro is the one I would buy, and it is not close for most households. Transmit, receive and bypass modes cover the TV, the stereo and the headphones in one corded box, and the SABRE DAC with a 121dB signal-to-noise ratio backs up the audiophile claim with a number rather than a slogan. The HiBy W3 is a smart little kit, but it solves a much smaller problem. Buy the W3 only if your listening is personal, wired and on the move. Check the current price on Amazon before you decide, since the two sit in very different roles. If you want the flexible home-audio hub, go 1Mii.
They are not really competitors. The B03Pro is a home audio adapter with a DAC, optical/RCA/AUX inputs and dual-link Bluetooth; the W3 is a portable headphone amp with earphones. Pick based on your setup, not on which sounds more impressive on paper.
No. Per the spec sheet, transmit and receive modes cannot run simultaneously — you select one. If you need both directions, you will be switching modes rather than running them together.
Yes. Your headphones or speaker must support the matching codec, otherwise the link falls back to a standard Bluetooth codec. Also note that connecting two aptX LL headphones switches the codec to aptX for stability.
No. There is no optical or RCA input and no transmit mode described for it. It is a headphone amp bundled with HiBy Yves earphones, aimed at wired personal listening, not living-room audio.
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