Last year, after having my car MOT I was given a key fob roughly the size and shape of a pen drive in clear dark plastic.
About 11 months later the gizmo began displaying at 1 second intervals the stalwart message "MOT DUE"
It has done it faithfully for over 5 months now.
I've always liked to understand how something works and my investigations are often more destructive than informative.
So I can understand a timer once triggered continuing to switch the LCD until the battery goes flat. BUT - here's the interesting bit, a blue LED shines briefly at lengthy intervals.
Probably a reminder that the battery is about to go flat!
This thread is now locked and can not be replied to.
Best phone camera 2017
Stunning new film posters by Hattie Stewart, Joe Cruz & more
iPad Pro 10.5in (2017) review
28 astuces pour profiter au mieux de votre iPhone
© Copyright 2017 IDG UK. All Rights Reserved.