Sensor change and calibrate in diabox

I almost always carry it in my arm and crush it sleeping and it doesn't give me hypos.
@Ruthbia, in the middle of the ass?I didn't know what could be put there.

@Anaisabel I never in the arm.I have been in the buttock for 7 years.The 2 Pyrenees I bought put them in the arm and one disappeared with a door and another with a backpack, so, never again.
Before there were two fingers below the elastic of underwear, also of the bikini, and now I have risk a little below, without reaching the area of ​​sitting, in case it bothers, and measures me great.

I have had sensors that have given me hypos when crushing them and others who, all night on them and have not failed me.