Trobla for iPhone 6/7/8 and X and Plus Amplifier belongs to the world of electronics, but you won't face that dreaded low-battery symbol. There is no need to plug in or charge this speaker to amplify your phone's volume. Built from locally sourced and certified Slovenian wood, the sound travels smoothly through a hollowed chamber and is guided by a cone. The only electronic component involved is your smartphone.The Trobla is easy to carry and simple to use. Comes with Adapter for the iPhone 6/7/8 and X Plus models.