If you want a versatile 3-in-1 adapter with TF card playback and an extended battery for long-haul travel, choose Herfair 5.4; if you need a clear visual display of connected devices and Qualcomm chipset stability for syncing multiple headphones, choose Nulaxy Airplane.
• Herfair 5.4: Its biggest strength is the unique 3-in-1 design that includes a built-in TF card player alongside standard Bluetooth TX/RX modes, paired with a massive 18-hour battery life ideal for marathon flights or all-day workouts. The trade-off is the lack of a digital screen to visually confirm connection status, requiring reliance on LED indicators. This pick is for travelers who want to listen to local music files directly from a card without needing a phone.
• Nulaxy Airplane: Its standout feature is the integrated OLED screen that clearly shows battery levels and which specific devices are currently paired, plus it utilizes a high-quality Qualcomm chipset for robust signal handling. The trade-off is the slightly shorter battery life in transmitter mode (15 hours) compared to its competitor, and the absence of a dedicated media card slot. This pick is for users who prioritize visual feedback and dual-device pairing reliability above all else.
The Herfair 5.4 is designed for the traveler who wants maximum flexibility in how they consume audio, particularly when internet connectivity is unreliable or unavailable. What sets this device apart in the crowded market of airplane adapters is its inclusion of a TF card reader mode. While most competitors rely entirely on your smartphone or tablet to stream content, this adapter allows you to play MP3, WAV, FLAC, or APE files directly from a microSD card. This makes it a powerful tool for long-distance commuters or pilots who want a curated playlist of podcasts or music ready to go without draining their phone's battery or needing a data connection.
For those who use bluetooth headphones for cycling or spend hours in the gym, the 18-hour battery life is a game-changer. You can charge the unit once and take it through multiple training sessions or a cross-country flight without worrying about finding an outlet. The ability to use the device while it is charging via USB-C adds another layer of convenience, ensuring you never hit a dead zone during a critical moment. The colorful design also suggests a user-friendly approach, aiming to make the tech feel less sterile and more like a personal accessory.
However, you should skip this model if you prefer seeing exactly what is happening with your connection. Because there is no screen, you must rely on the battery indicator lights to know if the device is fully charged or if it has successfully paired. If you are the type of person who needs immediate visual confirmation before you put on your earbuds, the lack of a display might feel like a step backward. Additionally, if you don't plan on using a memory card, you are paying for a feature you won't utilize, making this a niche choice rather than a universal one.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-24 · 6 min read · Independent comparison
The Nulaxy Airplane targets the user who values precision and visual clarity above all else. The defining characteristic here is the small but functional screen that displays both the battery percentage and the list of connected devices. In a situation where you are trying to pair two pairs of AirPods simultaneously—a common request for couples traveling together—this screen removes the guesswork. You can instantly see if the first headset is connected and if the second one is attempting to join, providing a level of transparency that simple LED lights cannot match.
This adapter shines when used with the Qualcomm chipset, which is known for offering superior stability and lower latency compared to generic chips. This is crucial for sweatproof true wireless earbuds for cycling or any scenario where audio dropouts are unacceptable. The device supports dual Bluetooth connections in both Transmitter and Receiver modes, meaning you can connect two headsets to a single source, whether that is an airplane seatback jack or a home stereo system. The built-in microphone works for calls in Receiver mode, though it is important to note that call controls do not function in Transmitter mode, so this is primarily an audio delivery device for travel and entertainment.
You might find this product less suitable if your primary use case involves playing offline media files without a source device. Unlike the Herfair, the Nulaxy does not have a slot for TF cards, so you must always have a phone, laptop, or other audio source plugged into the 3.5mm AUX input to get sound. Furthermore, while the 20-hour battery life in Receiver mode is impressive, the 15-hour limit in Transmitter mode is slightly lower than the Herfair's offering. If you are taking a 16-hour flight and only plan to use the airplane jack, the Herfair gives you a safety margin that the Nulaxy lacks.
• Best for Offline Media Playback → Herfair 5.4: Only the Herfair offers a TF card slot, allowing you to bypass your phone entirely and play music files stored locally on a memory card.
• Best for Visual Connection Feedback → Nulaxy Airplane: The built-in screen provides real-time updates on battery status and active device connections, eliminating pairing confusion.
• Best for Long-Haul Battery Life → Herfair 5.4: With an 18-hour runtime, this unit edges out the Nulaxy, making it safer for very long international flights or multi-day camping trips.
• Best for Dual Device Pairing Clarity → Nulaxy Airplane: The screen explicitly lists connected devices, which is essential when trying to manage two headsets simultaneously for travel companions.
• Best Chipset Performance → Nulaxy Airplane: Equipped with a Qualcomm chipset, this adapter promises higher stability and better resistance to interference compared to the standard Bluetooth implementation in the Herfair.
• Best Value for Versatility → Herfair 5.4: The inclusion of three distinct modes (TX, RX, and Card Player) in a single 50g unit offers more functional variety for the price point.
• Best for Call Functionality → Nulaxy Airplane: The built-in microphone is specifically designed for use in Receiver mode, whereas the Herfair focuses purely on audio transmission without explicit call features mentioned.
• Best for Quick Charging Awareness → Nulaxy Airplane: The screen shows exact percentages, giving you a precise idea of remaining power rather than a general low/high indicator.
After analyzing the specifications and design philosophies of both units, I would personally buy the Nulaxy Airplane for my own travel needs. The presence of the screen and the Qualcomm chipset addresses the two biggest pain points in wireless adapters: uncertainty about connection status and occasional audio lag. Knowing exactly which device is connected and having a stable signal is worth the slight reduction in battery life. However, if your priority is strictly listening to offline files on a long trip without touching your phone, the Herfair 5.4 becomes the undeniable winner due to its unique card player capability. Ultimately, for best wireless earbuds for cycling and general travel, the Nulaxy's reliability wins out, but the Herfair remains a fantastic alternative for the specific media enthusiast.
Yes, the Bluetooth 5.4 technology ensures a strong connection with modern waterproof earbuds, making it suitable for active use where moisture resistance is key.
Absolutely, the Nulaxy supports dual Bluetooth connections in both TX and RX modes, and the screen will clearly display both connected devices for easy management.
Yes, unlike most adapters, the Herfair includes a TF card reader mode that allows you to play audio files directly from a microSD card without needing a paired phone.
The Herfair 5.4 offers a longer battery life of over 18 hours, whereas the Nulaxy Airplane provides 15 hours in Transmitter mode and 20 hours in Receiver mode.
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