This is about interesting things like Arduinos and whatnot.
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LoRa
Lora is a low-power long-range radio protocol. It operates on different frequencies around the world, and is optimised for small packets, usually unidirectional comms. This IOT devices and the like.
There's a lot of cheap boards out there nowadays, and Lora is one of the dominant protocols available on little ESP32 boards and stuff.
Someone reviewing various Lora-having boards: https://youtu.be/CJNq2I_PDHQ
Aliexpress listings: https://www.aliexpress.com/wholesale?SearchText=lora32u4
Here's a kit that looks like an ESP board with Lora radio, plus environmental sensors, ideal for sticking around the house: https://www.aliexpress.com/item/32913645927.html
A local company selling a really low power Lora board: https://wisen.com.au/store/products/whisper-node-lora/