Welcome to the forum, Tiziana.

For some reason I have generally found information available on the 'net for *S&W equipment to be in short supply.
Also, I'm not so sure that the Cardio-Aid MC+ sold in great numbers here in the UK.
But hopefully, someone on here will come up with the information you need.
In passing, I would comment that it sounds to me like a battery is on the way out (I'm guessing at a button cell on a circuit board somewhere).
Meanwhile, I'm interested the Italian Blue Cross insignia. Is that EU
iconography I see?

*
Other labelling may have been used:- Artema for example.