🚀 go-pugleaf

> 
> How do the clocks (and clock radios) that run on main power (110/60 Hz)
> count the time ? Especially those that use battery backups. In this case
> do they use a quartz crystal ? Does that mean that these can be used
> on 110/50 Hz or any other frequency ? Any info will be appreciated.
> 
The ones I am familiar with count the cycles of the power line.  When
they go into the backup mode an internal oscillator takes over which
can be quite inaccurate.  One of mine loses a couple of minutes an
hour in the backup mode.  I would suggest checking them after a fairly
long power failure.