The HRU 250 and HRU 300 have a PCI-e connector instead of an RJ45 connector. This adapter board lets you connect the non-CVE WiFi module without soldering.
You’ll also need a PCI-e splitter cable and a network cable — add them to your order, or get everything at once as a ready-made set.
Please note: the HRU 250 and HRU 300 are likely rebranded OEM models, so not all features are available as they are on other Itho devices. Controlling these HRU models through the add-on is only possible with a CC1101 RF module. Reading the status and changing settings does work without an RF module.