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. 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.

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. Both the Airfly Pro and Airfly Duo will allow you to listen to a device through your wireless headphones without connecting via Bluetooth. The main difference between the two is that the Airfly Dro does not allow for audio input, but it does offer an extra four hours of battery life. 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.

What I really love about Twelve South's Airfly, however, is just how darn easy it is to use. There's an on/off toggle on the side, next to which is a button to connect a nearby Bluetooth device. With my current best headphones sat atop my head - the Bose 700 being my current long-time winners - pairing was achieved in a matter of seconds (the headphones verbally telling me so). The only downside we can find to the Airfly Pro is that it cannot be used on phone calls. So if you have it plugged into a car or speaker, you will need to remove the device before answering the phone. What is the Airfly Duo? As you now know, Twelve South created the Airfly Pro so that consumers can enjoy listening to audio from devices that do not typically connect to wireless headphones.

The second new feature that AirFly Pro has is called Receive mode. Flip the switch on the side of the AirFly Pro dongle and it becomes the receiver of the Bluetooth transmission. Pair it with your iPhone, and then plug it into an aux-in port (like the one you might find in a car), and suddenly, your phone is wirelessly connected to your car (or a rental car, or a friend's car). I'm a big fan of Bluetooth receivers in my house. I own a lot of older speakers that don't support Bluetooth. As long as you have a 3.5mm aux-in port (not the headphone port, that's aux-out), this will make your home sound system Bluetooth enabled. So, if you're on a plane and you and your traveling companion both have your favorite pair of wireless active noise-canceling headphones, but only one of you has an AirFly Pro, you can both still enjoy using your favorite headphones (though you both would have to watch the same movie).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. 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). 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. You are now an Airfly expert, and it really is up to you to decide which device is the better option for you.