AirFly Duo lets two people listen to the same movie, podcast, or music with their favorite wireless headphones or earbuds. AirFly Pro adds the ability to stream music from your iPhone to an AUX IN in a car or speaker.

Will we be flying without the AirFly Duo again? Probably not. Overall, the ease of the device makes it worth carrying along on every trip. It’s compact enough to store in any travel bag, easy enough to connect with a number of devices and perhaps best of all, you can say goodbye to airline-supplied headphones forever. If you travel frequently — or seldom but have other places to use the transmitter — the AirFly devices are an absolute no-brainer. There’s plenty to love about the AirFly Duo. From its small and compact size, including the handy drawstring pouch, to the ease in connecting the device to your favorite headphones, it’s a terrific product that travelers should be excited to try out. It’s important to note that the Airfly Pro typically costs a little more, while the Airfly Duo can be found at a more affordable price. AirFly Pro, according to Twelve South, also sports a hefty 16-hour battery life. I have not had the opportunity to max out the battery life to test these claims, but I can tell you that I wore out my AirPods Pro twice while AirFly Pro kept ongoing.Twelve South has included a cap for the AirFly Pro that has a small key ring on it. I love this little addition because I can add it to my keychain and always have my AirFly Pro with me wherever I go. You never know when you're going to want to connect to the audio in a car. Pairing the AirFly with your favorite set of wireless headphones couldn’t be easier. After fully charging the device with the included charging cable, we were able to pair our set of AirPods Pro within 30 seconds with the push of a couple of buttons — one on the AirFly and one on the AirPods case. During our testing on a nearly completely full airplane, the AirFly had no difficulties producing sound without interfering with other Bluetooth headphones in the small space. Use AirFly Pro as an AUX IN adapter to send your iPhone's audio to the AUX IN in a rental car or older speaker

Once you have plugged it in, you will simply need to connect the Duo via Bluetooth to your wireless headphones of choice to enjoy listening to your favorite audio entertainment. Remember, the only real difference between these two devices is that the Pro offers an option to enjoy your entertainment through a speaker in your home, car, or even on a boat through the audio in option. However, the Duo will only play through your headphones. And that the Duo offers four more hours of enjoyment as the battery will last twenty hours instead of the sixteen that the Pro provides. Final Thoughts The only disadvantage to the Airfly Duo is that it does not come equipped with an audio in option. That means you cannot play audio from your phone to a speaker, car stereo, or various other devices like you can with the Pro. I also don't like it when gadgets don't provide battery level indicators. This is something Apple skips on, too, with its Smart Battery Case. On something as small as the AirFly Pro, it'd probably be very difficult to fit four LED status lights, but it'd be great to be able to press a button to see approximately how much battery life is left (based on how many lights light up).I'm yet to try the AirFly on any further flights, but I'm confident some systems will pose irks and difficulties: a lot of older American Airlines (and other carriers) use a tri-connector, for example, for which you'll need an adaptor (or a lot of patience in getting the stereo 'band' to sit across the right section to achieve mono output to both ears). What we particularly loved about the AirFly Duo is the fact that you can share audio with your travel partner. Because the device can be connected to two wireless Bluetooth devices at the same time, you and your travel partner can simultaneously watch the same movie in flight. Say goodbye to starting and pausing a film on your individual screens at the exact same time — the AirFly Duo ensures you stay in sync during your film or TV show. When it comes time to charge up AirFly Pro, you'll get a notification in the form of an amber blinking light. It'll flash three times to let you know its running low on juice. It comes with a charging cable (USB-A-to-USB-C) but the good news is it supports USB-C charging, so any one of the USB-C cables you have lying around will juice it up. I tested this out with my S.O. and a multiplayer game on Nintendo Switch. Each of us wearing our own set of headphones could play a game on the Switch with the AirFly Pro.