10 Best Bluetooth Audio Transmitters 2025 in the United States

The Avantree Relay is a premium Bluetooth audio transmitter designed primarily for travelers and anyone looking to enhance their audio experience on planes, TVs, or gym equipment. With Bluetooth 5.3, it offers improved connection stability and supports high-quality audio codecs like aptX Adaptive and Low Latency, making it a great choice for those who appreciate clear sound with minimal delays. The ability to connect two devices simultaneously is a standout feature, allowing you to share music or movies with a friend during a flight. Additionally, its long battery life of up to 20 hours is impressive, ensuring it can last through long travels, and it conveniently allows for use while charging if the battery does run low.

However, the Relay does have some limitations. Its reliance on a 3.5mm AUX jack means it won't be compatible with devices that lack this option, though the included dual adapter addresses this for planes. While the controls are user-friendly, some may find the LED indicators a bit too simplistic for monitoring connections and battery levels. Furthermore, while aptX support is a significant strength, not all Bluetooth headphones utilize this codec, which may limit audio quality for some users.

The Avantree Relay is well-suited for those who travel frequently or want to connect audio devices conveniently, but potential buyers should consider their specific needs regarding device compatibility and codec support.

The Bluetooth 5.4 Transmitter Receiver, also known as the B103, stands out as a versatile option for anyone needing a reliable Bluetooth audio solution, whether at home, in the car, or during air travel. Its ability to switch between transmitter and receiver modes means you can easily stream audio from non-Bluetooth devices like TVs or computers to your Bluetooth headphones, and vice versa, allowing smartphones to connect to wired speakers.

A significant advantage of this device is its advanced Bluetooth 5.4 technology paired with a Qualcomm chip. This combination ensures strong connections and supports high-quality audio codecs such as aptX Low Latency, which minimizes audio delay—making it perfect for watching TV or enjoying in-flight entertainment. With over 24 hours of battery life on a single charge, it promises long usage periods without frequent recharging, which is particularly beneficial for travel.

Additionally, the B103 is user-friendly, featuring a simple setup process and a 'RESET' button for easy reconnections. It’s compatible with various devices thanks to its dual 3.5mm adapter, making it a great choice for gym equipment, tablets, and PCs. However, the requirement for aptX Low Latency support on both the transmitter and receiving device might limit its use with some older models that don’t support this codec. Users may experience challenges with pairing, especially if multiple Bluetooth devices are nearby.

The Twelve South AirFly SE is a handy Bluetooth audio transmitter that can connect to any device with a 3.5mm audio jack, making it ideal for travelers, gym-goers, or anyone wanting to enjoy wireless audio from their devices. One of its standout features is the extended battery life, lasting over 20 hours on a single charge, which is perfect for long flights or extended use. You can even use it while it's charging, ensuring you won't miss out on your favorite tunes or shows. Its lightweight and compact design makes it easy to carry around, fitting well into travel bags without taking up much space.

This device supports low latency, which is great for watching videos or playing games, as it minimizes audio lag, ensuring a better viewing experience. The ability to pair with multiple devices is another plus, allowing you to connect two pairs of headphones at once, perfect for sharing media with a friend or family member.

There are a few drawbacks to consider. The reliance on a 3.5mm jack means that it won’t work with devices that lack this port, like newer smartphones that only support USB-C or Lightning connections directly. Lastly, while the design is attractive, the iridescent color may not appeal to everyone, and it could show fingerprints or smudges more easily than a matte finish.