If you want a USB-C transmitter with broad codec support and Auracast broadcasting for jogging with compatible wireless headphones, choose eppfun Le Audio USB; if you need a travel-focused adapter for an airplane’s 3.5 mm audio jack, choose Avantree Relay & Voyager.
For jogging, I’d lean toward eppfun because its listed uses include mobile devices and its USB-C design is aimed at sending audio to wireless headphones.
Avantree is the more focused choice for airplane entertainment, with a 3.5 mm AUX connection and built-in controls.
eppfun Le Audio USB vs Avantree Relay & Voyager at a Glance
• Avantree Relay & Voyager: Its 3.5 mm AUX input, pairing controls, and battery-level indicators suit airplane use. Its main limitation is that it is not compatible with phones, car stereos, or hearing aids.
• For jogging: eppfun is the more relevant fit when your audio source and headphones support its connection and codecs; neither product’s listed features establish a secure earbud fit or a sports-specific design.
• For flights: Avantree is the more direct match if you want to send audio from an airplane’s AUX jack to Bluetooth headphones.
• Choose eppfun for a USB-C transmitter with multiple codec options and Auracast broadcast mode. Choose Avantree for a compact, carryable adapter with physical controls for travel.
The eppfun Le Audio USB is a USB-C Bluetooth transmitter intended to send audio from compatible devices to wireless headphones or earbuds. Its listed compatible devices include gaming consoles, laptops, and smartphones, and its stated operating-system support includes Windows, Linux, Apple, and Android, as well as Switch and PS5. That gives it a broader source-device role than a dedicated airplane adapter.
Its codec options include LDAC, aptX, aptX Adaptive, aptX Low Latency, aptX Lossless, SBC, and LC3. That breadth is useful only when the listening device supports the same codec; having a transmitter support a format does not make an incompatible headset use it. The product also uses LED indicators to show working status, and it offers Auracast broadcast mode for sending audio to multiple receiving devices that support the relevant setup. The sheet describes multi-receiver use, including scenarios with more than 100 receivers, but that is a broadcast capability—not a promise that every Bluetooth headphone will connect to it.
For jogging, eppfun makes sense if you already have a compatible USB-C audio source and wireless headphones that support a matching codec. Its listed features don’t tell us whether a particular pair of earbuds stays secure during movement, so it shouldn’t be mistaken for a sports headset. Skip it if your source requires a 3.5 mm airplane jack, or if you need an adapter with listed built-in volume and pairing controls.
Avantree Relay & Voyager is framed around travel. It connects to an airplane’s 3.5 mm AUX jack and transmits audio to Bluetooth headphones, including AirPods and other Bluetooth headphone brands described in its product details. Bluetooth 5.3 and aptX Adaptive and aptX Low Latency support are listed. As with eppfun, the codec matters only when the headphones also support it.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
The built-in controls are a practical distinction: the product sheet lists volume adjustment, pairing, reconnection, clearing pairing history, and battery-level display, with LED indicators for connections and battery levels. It’s described as lightweight, pocket-sized, and suitable for travel and gym sessions. Those details point to an adapter designed to be carried and operated as a standalone travel accessory, rather than a USB-C transmitter intended to work across a range of source devices.
The central constraint is compatibility. Avantree specifically is not compatible with phones, car stereos, or hearing aids, so it is not the more flexible everyday phone transmitter. For jogging, its mention of gym sessions suggests portability, but the stated airplane AUX connection doesn’t by itself make it the more natural choice for listening from a phone while running. Skip it if you need a phone-connected transmitter or want the listed Auracast broadcast function.
• Best fit for a USB-C source → eppfun Le Audio USB. Its connection and listed compatibility cover smartphones, laptops, and gaming devices, subject to the source working with the adapter.
• Best fit for an airplane’s 3.5 mm AUX jack → Avantree Relay & Voyager. That is its clearly stated use, with audio sent from the airplane system to Bluetooth headphones.
• More codec options listed → eppfun Le Audio USB. It lists LDAC, aptX, aptX Adaptive, aptX Low Latency, aptX Lossless, SBC, and LC3; the headphones must support the chosen codec too.
• Simpler on-device controls → Avantree Relay & Voyager. Its listed buttons and indicators cover volume, pairing, reconnection, pairing-history clearing, and battery status.
• For sharing audio with multiple compatible receivers → eppfun Le Audio USB. Its Auracast mode is designed for one-to-many broadcasting, rather than only a single listening connection.
• For an adapter described as pocket-sized and travel-ready → Avantree Relay & Voyager. Its compact carry design is an explicit feature, while eppfun’s listed strengths center on source compatibility and audio protocols.
• For jogging with a phone and wireless headphones → eppfun is the more plausible match, provided the connection works with your setup. Neither sheet confirms sweat resistance, a secure fit, or a jogging-specific wearing design.
• For someone focused on sleep headphones for jogging → neither is a sleep-headphone product. The sheets describe audio transmitters, not headphones, and give no sleep-specific comfort or fit information.
Before choosing, check the connection on the audio source you plan to use. Eppfun is a USB-C transmitter, while Avantree is meant to plug into a 3.5 mm AUX jack for airplane audio. Those connection types point to different jobs; an AUX-only flight setup is not interchangeable with a USB-C phone setup.
Next, check the headphone’s supported codecs. Eppfun offers more formats on its specification list, but that is useful only if the receiving headphones support the same one. Avantree’s aptX Adaptive and aptX Low Latency support also depends on compatible headphones. If your headset does not support a matching codec, the transmitter’s expanded codec list alone will not deliver that format.
Finally, decide whether you need sharing or straightforward travel controls. Auracast is eppfun’s distinct advantage for broadcasting to multiple compatible receivers. Avantree instead emphasizes controls and battery indicators on the adapter itself. If you’re comparing the overall value of either setup, check the current price on Amazon and consider the cost of any compatible headphones separately; this comparison does not establish what those extras will cost.
My Verdict
I would choose eppfun Le Audio USB for the broader role: USB-C source compatibility, a longer list of supported codecs, and Auracast make it the more flexible transmitter on paper.
For jogging, I’d pair it only with headphones that match the source connection and provide the fit I want; the transmitter itself doesn’t establish sports comfort or stability.
I’d choose Avantree Relay & Voyager instead when the main job is getting airplane AUX audio to Bluetooth headphones and having pairing and volume controls on the adapter.
For a compatible USB-C phone setup, eppfun is the more relevant transmitter based on its listed device compatibility. Neither product sheet confirms a secure sports fit, sweat resistance, or jogging-specific headphone design.
The product details say it is not compatible with phones. Its stated use is connecting to an airplane’s 3.5 mm AUX jack and transmitting audio to Bluetooth headphones.
Both list aptX Low Latency support. To use that codec, the receiving headphones must also support it; the feature list alone does not guarantee low latency with every Bluetooth headset.
Eppfun lists Auracast broadcast mode for sending audio to multiple receiving devices. Those receivers need to support the relevant Auracast setup; the product sheet does not establish that ordinary Bluetooth headphones can all join a broadcast.
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