Am searching for some messaging sensor

Hey there
Im looking for some kind of messaging sensor.
I need a device that beeps (prevered) or vibrates, to notice me.
This should be fitting in my trousers pockets.
I dont want to use my smartphone for this.

I got Zigbee and Wifi for communication.

Anyone knows such a device? I cant find anything.

Do you want it to only work at home or when not connected to your local network as well?

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It’s enough if this device works at home.
There is no need for it to work outside my local network.