PSF-A85 is a $2 ESP8285 WiFi Board for IoT and Wearables
ESP8285 is a cousin of ESP8266 WiSoC, but allows for smaller designs. That $2 module is just 1.4 x 1.3 cm in size.
Welcome to the New World of ESP
PSF-A85 is a $2 ESP8285 WiFi Board for…
Welcome to the New World of ESP
PSF-A85 is a $2 ESP8285 WiFi Board for IoT and Wearables
ESP8285 is a cousin of ESP8266 WiSoC, but allows for smaller designs. That $2 module is just 1.4 x 1.3 cm in size.
itead states that this module has been retired.
https://www.itead.cc/psf-a85.html
Do you have another source ?