Does Bluetooth need to be on?

I understand that you need to be on the Thor 4 in order to pair wireless earphones to listen to music downloaded to the Thor 4, but does it need to be on for notifications to be received on the Thor 4?  Yes, I always have Bluetooth turned on on my Android smartphone.

Yes, bluetooth nerfs to ne on since the watch communicates with your phone through it. Wifi is only for data.