One of the better things to appear in computers of recent vintage is the SD-card reader, which lets us slot the memory-cards from our cameras directly into our notebooks and slurp off the photographs.

SumUp, the London-based payments startup, today launched the SumUp 3G Reader — a card terminal that lets merchants process payments without the need for a mobile app or a constant Wi-Fi connection.

If you are a professional photographer, you don’t need reminding that time is money. Today’s cameras can shoot at very high speeds and a day’s shooting can easily fill a lot of memory cards with ...