It's normal. General rechargeable wireless mouse charging, to turn on the power switch of the mouse (some mice do not need to turn on the power switch), and then charge, charging the blue indicator light on the mouse, the red light at the bottom of the mouse (the mouse is put out after a period of time, this is the standby state of the mouse), full (the charger is not unplugged), some mouse is blue indicator light off, some mouse is not unplugged. Some of the blue light is still on, and the red light at the bottom is off. Unplug the charger, turn off the mouse switch, and charge the end.
Relatively speaking, the blue led than the red led to save electricity, although not much electricity; Some wireless mice now have blue leds. Refer to Reb 6200