Limited compatibility / power failure requires PIN input / no fax

At initial activation, and after power failure you have to enter your PIN again. Cards without PIN function without further interaction, even after power failure. For me important as an alarm system to call in an emergency and also if in between times of power failure.

A fax has failed after a fraction of a page.

During a telephone conversation you can hear crackles, but I do not use it, mainly, the alarm should be noticeable.