I bought some 3.3v buzzer on ebay, i wish to add it in to mifi and make it friendly reminder beeps then battery level 10% or less and in same time the external charger not plugged in.
So, how to track this two events?
First off Amazon gets large shipments so they probably have a lot of older stock.
The digital battery readout feature was introduced one month or so ago, maybe 2, so only people that ordered directly from the GL website probably have it.
You can check what mifi hardware you have by opening the case and reading the markings on the board