The battery level will not be available for examination in the wired mode with the battery being constantly charged, as the upper-left LED light dim and brighten slowly in orange to confirm the status, if the newest firmware is installed. In the wireless modes the battery level can be accessed through the color of the battery indicator by pressing Fn+|, or be put on permanent display by pressing Fn+]. The table below shows the power light color and corresponding battery level:  Green (Power >80%) Blue (Power 20%~80%) Red (Power <20%)