I lost my manual for my blue tooth and have had it packed away for awhile. I now want to use it and I don't remember how long to charge it, how do I know it has a complete charge and the blue light...........does it change colors and if so what do the colors mean. I am not sure if you are made aware of what Bluetooth I am I have a LG HBM-770 Thank you for your help, Joan Scholz