FiiO UTWS5 vs TRN BT20 Pro (2026): Which Wireless IEM Adapter to Buy
Codecs, DAC, charging, battery claims and connectors compared from the listings, so you can turn your wired IEMs into a wireless pair.
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Three specs decide the fiio utws5 vs trn bt20 pro question. The UTWS5 supports LDAC and aptX Adaptive on top of AAC and SBC, the BT20 Pro lists AAC and SBC only. The UTWS5 has its own AK4332 DAC, and its hooks charge through a wireless coil instead of exposed contacts.
So: an Android user who wants the wider codec list and an EQ app should buy the UTWS5. An iPhone user, who gets AAC on either one, can look hard at the BT20 Pro and its stated 13 hours per charge. For more hooks and dongles, see our Bluetooth adapters for IEMs guide.
The two adapters
1. FiiO UTWS5 (2025)
Best for: Android listeners who want LDAC or aptX Adaptive, an EQ app and no exposed charging contacts.
The UTWS5 pairs an independent AK4332 DAC with a Qualcomm QCC5141 Bluetooth chip. It runs Bluetooth 5.2 and supports SBC, AAC, aptX, aptX Adaptive and LDAC. FiiO says aptX Adaptive carries up to 96kHz/24-bit audio with lower latency, and aptX Voice handles 32kHz wideband calls.
Each ear hook has a miniature wireless charging coil. FiiO says this removes the oxidation problem of traditional charging contacts and makes the hooks resistant to sweat. In FiiO’s app you get 7 preset tuning styles plus ten EQ points with adjustable gain and bandwidth. The listing title says “20H Battery Life” but does not say whether that includes the case.
This listing is the MMCX version. FiiO also sells a 0.78mm 2-pin version, so pick the connector that matches your IEMs.
✓ What we like
- LDAC, aptX Adaptive, aptX, AAC and SBC
- Dedicated AK4332 DAC with a QCC5141 chip
- Wireless charging coil, no exposed contacts
- 7 presets and ten adjustable EQ points in FiiO’s app
- aptX Voice for calls
! Keep in mind
- The battery claim has no per-charge breakdown
- LDAC and aptX Adaptive need a phone that supports them, so iPhone users get AAC
- MMCX and 2-pin are separate versions, so order the right one
Skip it if: You use an iPhone and do not care about EQ.
🛒 Check price on Amazon↗ Opens Amazon.com · affiliate link, no extra cost to you2. TRN BT20 Pro
Best for: iPhone users who want a stated per-charge battery figure and a battery level indicator.
The BT20 Pro is a Bluetooth 5.3 ear-hook module with swappable connectors, sold without earphones. This listing is the MMCX version. TRN says Bluetooth 5.3 brings faster transmission, lower power use and better anti-interference.
TRN states 13 hours of playback per charge and up to 50 hours with the portable charging case. LED indicator lights show the battery level, and a water and sweat-resistant nanocoating protects against moisture. Codec support is AAC and SBC.
✓ What we like
- 13 hours per charge, up to 50 hours with the case (per TRN)
- Bluetooth 5.3
- LED battery level indicator
- Water and sweat-resistant nanocoating
- Swappable connectors
! Keep in mind
- AAC and SBC only, no aptX or LDAC
- The listing does not name a DAC or chip
- The listing does not mention an EQ app or call features
Skip it if: You use Android and want LDAC or aptX Adaptive.
🛒 Check price on Amazon↗ Opens Amazon.com · affiliate link, no extra cost to youWhy the UTWS5 beats the BT20 Pro for most listeners
The codec list is the biggest gap. On an Android phone with LDAC or aptX Adaptive, the UTWS5 can use them; the BT20 Pro cannot. FiiO also names its DAC and chip, while TRN’s listing does not, and the UTWS5’s wireless coil leaves no charging contacts exposed to sweat. Add the EQ in FiiO’s app and aptX Voice for calls, and it covers more needs.
The BT20 Pro makes more sense on an iPhone, where both adapters fall back to AAC. There, TRN’s clear battery claim of 13 hours per charge and up to 50 with the case, the LED battery indicator, the nanocoating and the swappable connectors are what you are choosing between.
FiiO UTWS5 vs TRN BT20 Pro: side by side
| Adapter | Bluetooth | Codecs (per listing) | Connector checked | Battery claim (per listing) | Charging |
|---|---|---|---|---|---|
| FiiO UTWS5 | 5.2 | SBC, AAC, aptX, aptX Adaptive, LDAC | MMCX (2-pin version sold) | “20H Battery Life” in title | Wireless coil in hooks |
| TRN BT20 Pro | 5.3 | AAC, SBC | MMCX (swappable connectors) | 13 hours per charge, up to 50 with case | Charging case |
A few more differences:
- DAC and chip: AK4332 and QCC5141 on the FiiO; not named on the TRN listing.
- Sweat: FiiO credits the contact-free coil; TRN uses a water and sweat-resistant nanocoating.
- EQ: FiiO’s app has 7 presets and ten adjustable points; the TRN listing mentions none.
- Calls: aptX Voice on the FiiO; the TRN listing does not cover calls.
How to choose
- Your phone: iPhones use AAC, so LDAC and aptX Adaptive matter mainly on Android.
- Your IEM connector: MMCX or 2-pin. The Shure SE215 uses MMCX, per Shure, so both MMCX versions match its connector type. Check the fit if your IEM has a recessed or tight socket. Our SE215 worth-it check covers that IEM.
- EQ: if you like to tune the sound, only the FiiO lists an app. Still picking the IEMs themselves? Start with our chi-fi beginner guide or the headphone buying guide.
- Battery habits: TRN gives a per-charge figure; FiiO gives one number in the title.
- Gym use: both mention sweat, in different ways. Check that the hooks sit comfortably around your ears, and see our ear tips guide for a seal that holds during workouts.
Alternatives
Lower-cost or simpler option: The KZ AZ09 Pro hooks fit 0.75mm or 0.78mm 2-pin IEMs only. They use a Qualcomm QCC3040 chip with Bluetooth 5.2 and support aptX, AAC and SBC, with up to 8 hours per charge and about 40 to 48 hours with the case, per the listing.
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Upgrade option: The iFi GO pod Max is a premium step up with aptX Lossless, LDAC and LHDC, Cirrus Logic DACs and balanced amplification. It uses an interchangeable ear loop system and charges by Qi wireless or USB-C.
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Different need: To stay wired, the Apple USB-C to 3.5mm Headphone Jack Adapter connects 3.5mm IEMs to USB-C devices that support iOS 10 or later.
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FAQ
Is the FiiO UTWS5 better than the TRN BT20 Pro?
For most listeners, yes. It lists more codecs, a dedicated AK4332 DAC, wireless charging coils and an EQ app. The BT20 Pro suits iPhone users who want a clear per-charge battery figure and an LED battery indicator.
Do the FiiO UTWS5 work with the Shure SE215?
The MMCX version matches the SE215’s MMCX connector type, per Shure. Check the fit if the socket is recessed or tight, since neither listing guarantees fit with a specific IEM.
Does the TRN BT20 Pro support aptX or LDAC?
Not according to its listing, which names AAC and SBC only. If you want aptX or LDAC, the UTWS5 or the KZ AZ09 Pro (aptX) are the options here.
Which has longer battery life?
TRN states 13 hours per charge and up to 50 hours with the case. FiiO’s title says “20H Battery Life” without saying whether the case is included, so the two cannot be compared directly.
Can I use these adapters on iPhone?
Both connect over Bluetooth and support AAC, which is what iPhones use. LDAC and aptX Adaptive on the UTWS5 will not be used on an iPhone.
Do I need MMCX or 2-pin?
Match the connector on your IEMs. Look where the cable meets the earpiece or check its listing: MMCX is a round snap connector, 2-pin uses two thin pins. Buying one as a present? See our gifts for IEM lovers and gifts for musicians who use IEMs.
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