The TTS is pretty solid, what did you use for that? Amazon Polly is the best options I know of personally, but I'd love to know what you use because it's pretty solid.
Seems to match what you are looking for, with an esp32, an e-ink display and a battery connection. It is also quite cheap. I use mine as a weather station.
I have good results with cheap ublox 6m's and 7m's from aliexpress. For some reason the 8m's I got were poor in sensitivity.
Adfruit ones also work great, but are a lot mor expensive, I do have several though.
PPS is criticial to proper timing. However... I was using the time synched systems for sound localization. But as they only cost around 7 euros on aliexpress, why not.
Has anyone got experience with such a product? If it works, I'll happy purchase but like most of us here I'm sure, I've been burned by expensive tech that doesn't follow through.
You can hear it in this video: https://www.youtube.com/watch?v=tfcme7maygw&t=131s
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