You can buy a voice recorder that will hold weeks of audio for tens of dollars.

Back of a TV is a decent hiding place. Wonder how they found it -was it actively transmitting?

ESP32-S3

I was making a joke, but it does look like they got their components from Seeed Studio based on photos.

https://assets.sfstandard.com/image/994911177489/image_k101c...

https://www.seeedstudio.com/XIAO-ESP32S3-Sense-p-5639.html

Apple HomeView