The Accu-Chek Mobile meter is delivered with time and date factory set. Power supply is served by a 3rd coil cell battery that is incorporated. During storage a protection foil avoids that the 2 AAA batteries lose any power and the preset is running based on the power of the coin cell.
When using your meter for the very first time, you do not have to insert the AAA batteries, just pull out the protective battery foil and the AAA batteries take power supply over.