CircuitMess Chatter - A DIY Wireless Communicator
https://www.elecrow.com/circuitmess-chatter-a-diy-wireless-communicator.html
Chatter is a free, private, security-first texting device.
It comes in a pair (2 pieces) because texting yourself is not as fun as you think.
Unlike your regular phone, this device does not need a cellular network or a SIM card to work because it creates
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CircuitMess Chatter operates on the 915 MHz LoRa frequency, which is mainly for the U.S. In the EU, LoRa typically uses 868 MHz, so it may not be compatible out of the box. Check if the device supports frequency adjustments for EU compliance.