the WS2320E console canNOT connect via USB (that USB port is for manufacturer use only like with the HP25x0 consoles) - only via WLAN ("WiFi") - it can store up to 3.500 records internally.
These records can be retrieved into a MS Access database on a Windows computer by the help of the WeatherSmartIP/WeatherSmartWiFi software.
It is definitely not expandable beyond temp/humid/wind/rain/solar sensors - it can only connect to a WH65/WS69 outdoor array which only provides the before mentioned data (plus pressure and indoor T/H from the console).
Like every modern Ecowitt console it can post its data not only to the 4 "standard" weather services (WU, WC, WOW, Ecowitt) but also to a customized server address (that's how it can connect to CumulusMX or weewx).
Metobridge users can directly cannot/retrieve data via its API.
You can buy from
https://shop.ecowitt.com, from the Ecowitt store at e.g. amazon.de or under the name WH4000SE from
https://www.froggit.de
They all ship to Finland too. By the way, when buying from Ecowitt in China you will already pay all import taxes into a EU country there. Only the delivery takes longer, but it may be worth comparing the pricing.