If you want a compact, flight-ready adapter with premium Qualcomm audio for a single laptop or airplane seat, choose Avantree Relay & Voyager; if you need a dual-link transmitter with an LCD screen and shared listening for your home entertainment setup, choose 1Mii B3+.
• Avantree Relay & Voyager: Its biggest strength is the dedicated travel design powered by a Qualcomm chipset with aptX Adaptive, making it ideal for high-fidelity mono listening on the go. Its trade-off is that it lacks multi-device connectivity options like optical inputs or dual headphone pairing, limiting it to simple 3.5mm aux connections. This pick is for the frequent flyer or commuter who needs a pocket-sized solution for a laptop or airplane.
• 1Mii B3+: The standout feature here is the ability to connect two Bluetooth headphones simultaneously while supporting both Optical and AUX inputs with a smart LCD display for real-time monitoring. However, its larger footprint and lack of portability make it less suitable for travel compared to the Avantree. This pick is for couples or families sharing a TV experience or gamers needing low latency in a stationary setup.
The Avantree Relay & Voyager is built around a specific philosophy: simplicity and mobility without sacrificing audio fidelity. At the heart of this device lies a premium Qualcomm chipset paired with Bluetooth 5.3 technology. This combination isn't just about connecting to your headphones; it is about maintaining a stable link that supports aptX Adaptive and HD audio codecs. When you are sitting in a cramped economy seat or trying to focus on work from a laptop in a busy coffee shop, that stability matters. The device handles high-quality wireless transmission with low latency, ensuring that what you hear matches the source perfectly, whether it is a movie on your tablet or music streamed from your computer.
Its physical form factor dictates its primary user base. The unit is described as lightweight and pocket-sized, designed specifically to be a "must-have travel essential." Unlike bulkier transmitters that require multiple cables and external power sources, the Avantree plugs directly into a 3.5mm AUX jack. It features built-in controls for volume adjustment, pairing, and reconnection, along with LED indicators that show battery levels and connection status. There is no complex menu system to navigate; you plug it in, pair your headphones, and listen. This makes it exceptionally user-friendly for anyone who wants a set-it-and-forget-it solution for their laptop or airplane entertainment system.
However, this focus on portability means you must accept certain limitations. The product documentation explicitly states that it is not compatible with phones, car stereos, or hearing aids, restricting its use primarily to devices with a 3.5mm output like older laptops, airplanes, or gym equipment. Furthermore, it does not support dual-link technology, meaning you cannot share audio with another person using separate headphones connected to this single adapter. If your goal is to watch a movie alone on a plane or listen to a podcast from your laptop while commuting, this device excels. But if you are looking to upgrade a home theater system or host a gaming session with a friend, the Avantree simply cannot deliver those experiences.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-31 · 7 min read · Independent comparison
The 1Mii B3+ takes a completely different approach, focusing on versatility and shared audio experiences within a home environment. While the Avantree is a traveler's companion, the 1Mii B3+ is a living room powerhouse. Its most defining capability is dual-link technology, which allows you to transmit audio to two Bluetooth headphones simultaneously. This feature transforms how families and couples interact with their media. You can enjoy a late-night movie or a quiet game session without disturbing others in the house, and crucially, both listeners get the same high-quality signal at the same time. This eliminates the need for a splitter or the awkwardness of one person wearing earbuds while the other listens through a speaker.
Connectivity is where the 1Mii B3+ truly shines compared to the portable competitor. It offers a wide range of input options, including Optical (TOSLINK), 3.5mm AUX, USB, and even TF card slots. This flexibility means it can integrate seamlessly into modern entertainment setups, connecting directly to TVs, soundbars, gaming consoles, and PCs. The inclusion of an integrated headphone stand and a 7-color RGB lighting feature adds a touch of aesthetic flair that appeals to tech enthusiasts. The device also boasts a clear LCD display that provides real-time information on connection status, audio modes, and settings, removing the guesswork often associated with Bluetooth adapters. You can see exactly what mode you are in and monitor the status of your connected devices without fumbling for buttons.
Audio quality is another pillar of the 1Mii B3+, supported by aptX Adaptive, aptX HD, and Low Latency technologies. These codecs ensure rich detail and improved clarity, reducing delay significantly for movies and gaming. The unit also supports soundbar passthrough, allowing you to keep your existing soundbar connected while routing private audio to your headphones. However, these advanced features come with a physical cost. The enclosure, made of ABS and metal, measures roughly 9.53 inches by 9.49 inches by 1.14 inches. This size makes it unsuitable for a backpack or carry-on bag. It is a desktop or shelf-bound device designed to stay plugged in and powered via USB-C. If you prioritize a robust home theater experience over portability, the 1Mii B3+ is the superior choice.
• Best for Travel and Portability → Avantree Relay & Voyager. Its compact, pocket-sized design and direct 3.5mm plug make it the only logical choice for flights, trains, or moving between rooms.
• Best for Shared Listening → 1Mii B3+. If you need to connect two sets of headphones at once for a partner or child, the Avantree cannot do this, but the 1Mii handles it effortlessly.
• Best Connectivity Options → 1Mii B3+. With Optical, USB, AUX, and SD card support, it fits almost any home entertainment system, whereas the Avantree is limited to 3.5mm inputs.
• Best for Laptop Use (Mobile) → Avantree Relay & Voyager. The small form factor and Bluetooth 5.3 stability make it ideal for pairing with a laptop on the go.
• Best for Gaming and Low Latency → 1Mii B3+. The dedicated Low Latency codec support and optical input make it superior for syncing audio with fast-paced games on a PC or console.
• Best User Interface → 1Mii B3+. The large LCD display offers more detailed feedback than the simple LED indicators found on the Avantree.
• Best for Simplicity → Avantree Relay & Voyager. Fewer ports and a straightforward plug-and-play nature reduce setup time for casual users.
• Best for Home Theater Integration → 1Mii B3+. The ability to pass audio to a soundbar while streaming privately to headphones creates a flexible viewing environment.
In my opinion, the choice between these two devices comes down to where you plan to use them most. If your primary goal is to enhance your laptop experience while traveling, perhaps during long flights or commutes, I would buy the Avantree Relay & Voyager. Its dedicated focus on high-fidelity audio via the Qualcomm chip and its tiny, pocket-friendly size make it the perfect for laptop companion when you are away from home. It solves the specific problem of wanting crystal clear calls earphones for laptop use without the bulk of a full transmitter box.
Conversely, if you are setting up a stationary entertainment center and want to share movies with a spouse or play multiplayer games without disturbing the household, the 1Mii B3+ is the clear winner. Its dual-link capability and extensive input options offer a level of functionality that the Avantree simply cannot match. Both are excellent products, but they serve different masters: one serves the traveler, and the other serves the home enthusiast.
The Avantree Relay & Voyager connects via a 3.5mm AUX jack, so it works with any laptop that has that port. The 1Mii B3+ offers USB and AUX inputs, providing broader compatibility for modern computers that may lack a headphone jack.
Yes, the 1Mii B3+ supports aptX Low Latency technology, which is specifically designed to reduce audio delay for gaming and video watching, ensuring your sound stays synced with the action.
The Avantree Relay & Voyager includes built-in controls to monitor its battery level via LED indicators. While it is rechargeable, its primary advantage is its compact design for travel, whereas the 1Mii B3+ relies on a USB-C corded electric power source for continuous operation.
At approximately 9.5 inches by 9.5 inches, the 1Mii B3+ is significantly larger than the Avantree and is designed as a stationary unit for a desk or entertainment center rather than a portable travel accessory.
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