Change of Notification Popup To OneSignal

I have been using a service provided by LetReach to send the notifications. This software is supposed to send a notice of every new post, but is unreliable.? I have to admit that I have not been checking regularly, but I have discovered that the notifications are sent for a few days and then there is a gap. So I intend to try another system.
In a few days I will trial OneSignal and you will notice an icon like this:

which will invite you to agree to receive notifications. This appears to be a far better system which should be more reliable. Please agree to allow notifications from OneSignal and then unsubscribe from LetReach which I will discontinue.
I will send out notifications of this new arrangement several times to make sure that everyone is aware of the change, so I apologize in advance if you feel you are receiving too many.
Update April27
I have today added the OneSignal icon and am removing the Letreach service so if you want to be notified of new posts please subscribe to OneSignal via the red icon.