Both colours are normal. In either blue or green, a flashing LED indicates that the product is being charged. Whereas a glowing LED in solid colour (while plugged in) means charging is finished. The effectiveness of the product is the same in either colour.

[BLUE] When the product is plugged in while it is "on", the LED will flash in blue. After the product is fully charged, the LED will turn to a solid blue. Once it is unplugged from power, the light will remain solid blue and the product continues its operation.

[GREEN] When the product is plugged in while it is "off", the LED will flash in green. After the product is fully charged, the LED will turn to a solid green. Once it is unplugged from power, the light will go off and the product remains switched off. LED will light up in blue when the product is switched back on.