You can find an app you can use with the SoundLink Max, but it is not obligatory. If you are doing use it, you'll get usage of EQing, speaker customization possibilities, and firmware updates. It’s just like the size of a small clutch bag, with an extremely small strap https://www.bluetoothspeaker.top/home-theatre-system-woofer-sport-speaker-led-bluetooth-speaker/