List of notification sounds somewhere? - Meta Gen1

I keep hearing a chime like every hour in my glasses, but I cannot identify what it means. it's not a message notification, it's nothing I've heard before and I can't understand what it means. It's getting anoying because I don't know why that is happening and I can't really tell, I've played with the settings but it's still there. No notifications or nothing are displayed in my phone. Is anyone experiencing this? Is there a list of "sounds" so I can identify , at least, what the glasses are trying to tell me?

Thanks