If you want a simple Bluetooth receiver for a car or wired audio setup for school, choose COMSOON AUX; if you need a wireless module for compatible in-ear headphones, choose Fanmusic TRN BT20.
The key difference is what each device connects to: COMSOON AUX adds Bluetooth to equipment with a 3.5 mm AUX input, while the BT20 Pro is a replacement wireless connection module for compatible earphones.
For school, the more practical option depends on whether you want to use an existing AUX-equipped stereo or bring your own compatible in-ear headphones.
• COMSOON AUX’s biggest strength: a 3.5 mm Bluetooth receiver with an LED display, hands-free calling and up to 12 hours of use. Trade-off: it requires an AUX input and does not include headphones.
• Fanmusic TRN BT20’s biggest strength: a wireless module with swappable 0.78 mm 2-pin earphone connectors, up to 13 hours per charge and up to 50 hours with its portable charging case. Trade-off: headphones are not included, and it only suits compatible earphones.
• Choose COMSOON AUX if you want to add wireless audio and calls to a car, home stereo or wired headphones with a 3.5 mm connection.
• Choose Fanmusic TRN BT20 if you already have compatible in-ear headphones and want to use them wirelessly.
COMSOON AUX is a Bluetooth receiver, not a pair of headphones. Plug it into a 3.5 mm AUX-IN port, pair it with a phone or another Bluetooth device, and it can send audio to the connected stereo or wired headphones. That makes it the more straightforward choice for a car or home audio setup that has an auxiliary input but lacks Bluetooth.
Its LED screen shows remaining power and volume, and the device can report the battery percentage when you press its MCF button. Volume is adjusted with the plus and minus controls. The built-in microphone and CVC8.0 noise reduction are designed to support hands-free calls, with a multifunction button for call functions. Those controls may be useful when the receiver is connected to a car stereo, where keeping phone handling to a minimum matters.
COMSOON specifies up to 12 hours of use for calls or music, a two-hour full charge, and operation while charging. Bluetooth 5.3 and memory-based reconnection to the last-used device add convenience for regular use. It can connect to two devices at once, but switching music sources requires pausing one before playing the other. For school, it could suit a student who wants to use an AUX-equipped stereo or wired headphones with a phone; it is not a standalone headphone solution.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-21 · 7 min read · Independent comparison
Who should skip it: Skip COMSOON AUX if your equipment has no 3.5 mm AUX input or if you want a self-contained pair of wireless headphones.
The Fanmusic TRN BT20 Pro is a wireless earphone module, not a complete set of headphones. Its specified connector is 0.78 mm, 2-pin, and its swappable design is intended to work with compatible earphones. If you already own earphones with the right connector, the module lets you use them over Bluetooth instead of plugging them into a phone or other source.
The module uses Bluetooth 5.3 and supports AAC and SBC. Those formats are intended for wireless listening, video and gaming, but the connection still depends on compatible earphones and the Bluetooth source. The stated Bluetooth range is 15 meters. A water- and sweat-resistant nanocoating is intended to help protect the modules from moisture, which may be useful when wearing them outdoors or during active use. The product’s listed noise control is none, so it is not the option here for someone specifically seeking noise cancellation.
Fanmusic lists up to 13 hours of playback per charge and up to 50 hours when used with the portable charging case. The LED indicators show battery level; the listed charge times are two hours for the module battery and 150 minutes for the case. For school, that may appeal to someone who prefers in-ear listening and already has compatible earphones. The main compromise is compatibility: the module does not include headphones, and a 3.5 mm plug by itself is not the connection it uses.
Who should skip it: Skip the BT20 Pro if you do not have compatible 0.78 mm 2-pin earphones or want an all-in-one headphone set.
• Best for a car or stereo with AUX → COMSOON AUX. Its 3.5 mm output is designed to connect to an AUX input, adding Bluetooth audio and calls to compatible equipment.
• Best for compatible wired in-ear headphones → Fanmusic TRN BT20. Its 0.78 mm, 2-pin connectors are the key fit requirement.
• Best for visible battery and volume information → COMSOON AUX. The screen displays remaining power and volume, and its MCF button can show battery percentage.
• Best for longer stated playback with the case → Fanmusic TRN BT20. It lists up to 13 hours per charge and up to 50 hours when used with its portable charging case.
• Best for hands-free calls in an AUX setup → COMSOON AUX. It has a built-in microphone, CVC8.0 noise reduction and a multifunction call button.
• Best for switching between compatible earphones → Fanmusic TRN BT20. Its swappable connector design is intended to support different compatible earpieces.
• Best for use while charging → COMSOON AUX. Its specifications say it can play while charging; the BT20 Pro’s supplied details do not make that same claim.
• Best for moisture protection → Fanmusic TRN BT20. Its nanocoating is described as water- and sweat-resistant, while no comparable protection is specified for COMSOON AUX.
Buying Considerations
For the BT20 Pro, check the earphone connector rather than assuming any wired headphone will work. The supplied model is identified as 0.78 mm, 2-pin, and headphones are not included. If your earphones use a different connector, or you are still shopping for the earphones themselves, account for that before choosing the module. The stated compatibility is not a promise that every in-ear model will fit.
Battery figures are useful, but they describe different arrangements. COMSOON AUX specifies up to 12 hours and can be used while charging. The BT20 Pro specifies up to 13 hours on a charge, with up to 50 hours when used with the portable charging case. Those are not directly identical use scenarios. If you want to carry a charging case or already rely on compatible earphones, the BT20 setup may make sense; if you want the option to keep a receiver powered while charging, COMSOON makes that feature explicit.
Finally, consider the job you want the device to do. Neither product is a complete over-ear headphone set. COMSOON AUX is a receiver for an AUX-equipped system, while the BT20 Pro adds wireless capability to compatible in-ear earphones. Neither data sheet specifies spatial audio, and the BT20 Pro lists no noise control. So a search for spatial audio gaming headphones for school points to a different kind of product: these two devices are connectivity options, not a defined spatial-audio headphone system.
For school, I would choose COMSOON AUX if I needed to add Bluetooth to an AUX-equipped car or stereo and wanted hands-free calling, a screen and use while charging.
I would choose Fanmusic TRN BT20 only if I already owned compatible 0.78 mm, 2-pin earphones and valued its portable charging case.
My overall pick for the broader AUX setup is COMSOON AUX, because its connection target and calling features are clear without requiring compatible in-ear headphones.
That is a practical recommendation based on the stated features, not a claim that it replaces a dedicated headphone set.
FAQ
Does COMSOON AUX work with any car?
Does the Fanmusic TRN BT20 include headphones?
No. The BT20 Pro is a wireless module, and its product name specifies that headphones are not included. The listed version uses a 0.78 mm, 2-pin connector, so check your earphones’ connection before choosing it.
The BT20 Pro lists up to 13 hours per charge and up to 50 hours when used with its portable charging case. COMSOON AUX lists up to 12 hours and can be used while charging. These figures describe different setups, so the more useful choice depends on whether you need the case or charging during use.
The provided specifications do not identify spatial audio for either product. The BT20 Pro supports AAC and SBC and is described for gaming, but that alone does not establish spatial-audio support. Choose based on the connection you need, not on an expectation of a specified spatial-audio feature.
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