We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-07 · 6 min read · Independent comparison
If you want to turn any wired speaker, car stereo or old pair of headphones into a wireless Bluetooth device for pc and phone use, choose COMSOON AUX; if you need a standalone music player with sleep headphones, FM radio and offline storage, choose Pmjebe MP3.
• COMSOON AUX biggest strength: Bluetooth 5.3 receiver with a built-in mic, CVC8.0 noise reduction and a 12-hour battery — it makes wired audio gear wireless.
• COMSOON AUX biggest trade-off: It has no screen for music browsing and no storage of its own; it only works where you have a 3.5mm AUX-IN port.
• Pmjebe MP3 biggest strength: 32GB of built-in memory (expandable to 256GB), a 2.4-inch touch screen, up to 50 hours of playback and roughly 100 built-in sleep/hypnosis tracks.
• Pmjebe MP3 biggest trade-off: It is a self-contained player first — it does not add wireless calling or hands-free function to an existing stereo.
• Who each pick is for: COMSOON AUX is for anyone with a wired speaker, car or headphone jack who wants wireless audio and clear calls; Pmjebe MP3 is for listeners who want a pocket library and sleep audio without a phone.
Think of the COMSOON AUX as a bridge. Its job is to take a device that only knows how to accept a 3.5mm plug — a car aux input, a home stereo, a set of wired headphones, an older desktop speaker set — and let it talk Bluetooth 5.3. You plug it in, pair your phone or computer, and that wired gear suddenly streams. That is the whole appeal, and it does it with very few moving parts.
The features that matter most here are the ones around everyday use. There is a clear LED screen that shows remaining power and volume, and a "MCF" button to check battery percentage, so you are not guessing when it will die. The battery is rated up to 12 hours whether you are on calls or music, and it recharges in about 2 hours over USB — and crucially, you can keep using it while it charges. The built-in microphone plus CVC8.0 noise reduction is aimed at hands-free calling: answer, redial, hang up or reject from the multi-function button, which is genuinely useful if this lives in a car and you also want navigation prompts broadcast through your speakers.
The memory function auto-reconnects to the last device when you power it on, and it supports two connections at once — though switching sources means pausing one device before playing the other, which is worth knowing before you buy.
Pmjebe MP3: Who It's For
The Pmjebe MP3 is a different animal entirely. It is a self-contained player: 32GB of built-in memory (roughly 6000 songs), expandable via microSD up to 256GB, a 2.4-inch capacitive touch screen, and a slim body designed with classic buttons for simple navigation. It is palm-sized and light, built to slide into a pocket, wallet or armband, which makes it a natural fit for running, jogging, hiking and travel.
What sets it apart from a generic MP3 player is the sleep angle. It ships with sleep headphones and roughly 100 built-in audio tracks covering ASMR, white noise, rain, waves, meditation, brain waves and fast-sleep programs — the idea being that one of them will land for you. It also handles lossless formats (MP3, WMA, OGG, WAV, APE, FLAC, AAC-LC, ACELP), so if your library is FLAC-heavy you are covered, within the stated APE/FLAC limits of 8KHz–48KHz and 1000Kbps.
Battery life is the headline number: a 420mAh lithium-polymer cell rated up to 50 hours of playback, charged in about 2 hours over Type-C. It also packs FM radio and a voice recorder, connects over Bluetooth 5.3 to wireless headphones or speakers, and works with a car through the AUX port. Downloads are drag-and-drop from a computer, and the simple controls make it a reasonable first player for kids.
Buy it if you want music and sleep audio without draining your phone, or you want a screen-based player for workouts and travel. Skip it if your main goal is adding Bluetooth and hands-free calling to an existing wired stereo — that is not what this is built for.
• Best for adding Bluetooth to a wired device → COMSOON AUX. A 3.5mm aux-in port is the only requirement.
• Best for hands-free calls → COMSOON AUX. Built-in mic plus CVC8.0 noise reduction and one-button call control.
• Best for battery life → Pmjebe MP3. Up to 50 hours of playback versus up to 12 hours on the COMSOON.
• Best for offline music storage → Pmjebe MP3. 32GB built in, expandable to 256GB.
• Best for sleep and relaxation audio → Pmjebe MP3. Sleep headphones and roughly 100 built-in sleep tracks.
• Best for a screen-based interface → Pmjebe MP3. A 2.4-inch touch display; the COMSOON only shows power and volume.
• Best for a wireless headset for pc → COMSOON AUX if your computer or its speakers use a 3.5mm jack and you want to cut the cable.
• Best for a headphone for pc that is fully self-contained → Pmjebe MP3 if you would rather load music onto the player than stream from your computer.
For pc use specifically, I would buy the COMSOON AUX. In my opinion it solves the problem most people actually have: wired speakers, wired headphones or a car aux input that you want to use wirelessly with clear calls. It is a small, focused gadget that does one job well. The Pmjebe MP3 is the better pick only if you want a standalone player with sleep audio and long battery life — a genuinely different product, not a substitute. They are not really rivals; they answer two different questions. Check the current price on Amazon before you commit, since that is the one thing that can flip this decision.
FAQ
For calls and streaming from your phone, yes — it plugs into the aux input and adds hands-free calling. The Pmjebe MP3 also works in a car via AUX, but it plays its own stored files rather than acting as a Bluetooth receiver for incoming calls.
The Pmjebe MP3. It is rated up to 50 hours of playback from a 420mAh battery, while the COMSOON AUX is rated up to 12 hours of calls or music. Both charge in about 2 hours.
Only through a 3.5mm aux-in connection — it makes wired audio gear wireless, but it is not a USB headset. If your pc audio goes into a wired speaker set or headphones, it works well for that.
No. It stores up to 32GB internally and accepts a card up to 256GB, so you can load music by drag-and-drop and leave your phone out of it entirely.
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