Glance - Explain how the Interval option works?

[abel920]

It says "On intermittently to save battery", however I don't know exactly what that means and how exactly works. Can anyone be kind to explain to a noobie like me? :-(

 

[Zapella Tiago]

•Peek will use your proximity sensor to turn on the glance; wave on top of your screen and you will see the time popping up.

•Interval will show up the time in intervals based on your battery level.

•Always on will show up all the time.