1 how do i kniow when its fully cjharged 2 how long does it take to charge? how long does the charge last? there is a usb plug in spot and there is a a small charging out put i am wonder what one i use to charge it? what does the auxin and aux out mean?what also doesthe switch flat warm bright mean? there is 7 buttons on i this power on button, fwrd,rewind play\pause button,pair button and then that leaves the buuton on the left side and the button second to the last button on the left what r those 2 buttons? what r they 4?