The EcoTank ET-3850 skips Ethernet — it's Wi-Fi or USB only

The ET-3850 keeps things simple with USB 2.0 and Wi-Fi (b/g/n). There’s no Ethernet port, so if you need a wired network connection, this isn’t the model for you. Wi-Fi Direct is included for direct device-to-printer connections, which partly makes up for the missing wired networking.