NWT Up to 25+ hour battery life outlasts even the longest international flight Connect 2 pair of headphones with AirFly Duo or AirFly Pro to share music, movies and more 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 Available in 3 versions to suit your needs: AirFly SE, AirFly Duo, AirFly Pro