We search for how isolated the volume controls are. In other words and phrases, when your fingers try to find the buttons, how many do they find? If it’s two, that’s uncomplicated. 3 is similar, just with a play/pause button in the center. But a lot more than that, https://www.bluetoothspeaker.top/wholesale-waterproof-bluetooth-speaker-portable-mobile-phone-wireless-rgb-speaker/