How to display Warning Message for Product Timer!?

Version 4 V4 Request
1

Hi,

I have 6 Bilards, I’m using Product Timer and this is perfect but I have a request.

Please can you show a warning message if the During time in bilard will be 30min, 60min, 90min?

2

Please can anyone tell me how to display message to inform the worker about clients time.

They often forget to tell the clients that their prepaid time is over.

Please…!!!