[Dániel Buga], for instance, designed a compact ECG system the size of a credit card, cleverly dubbed Card/IO, that clearly demonstrates how to implement a single-lead ECG. Although obviously not ...

The SmartCard is a slim, credit-card-sized tracker that fits comfortably into your wallet. It offers the same reliable functionality as the AirTag but without the bulk. It boasts a longer-lasting ...

Luckily, there’s NanoPhone — your new backup phone that’s as small as a credit card and functional enough ... With its 5MP rear camera and 2MP front camera, it won’t be the highest quality ...