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.
![](https://sp-ao.shortpixel.ai/client/to_webp,q_lossless,ret_img,w_530,h_331/https://everythingesp.com/wp-content/uploads/2019/03/kccaT3kQrDjZqu9452X0xxxIILLRg24GStXzQZOocPCP42hHa5.jpg)
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 ?