Mi 3C Setup Manual page 5

When setting up as a secondary router:
1. If you want to setup the Mi WiFi router as a secondary router, click on 'more options' as
seen in step 4. There are basically 2 ways to set up the Mi WiFi Router 3c as a repeater:
Wireless repeater mode and wired repeater mode.
a. By clicking wireless repeater mode, you have the option to choose the existing WiFi
network you want to pair your Mi WiFi Router with.
Mi Wi-Fi Router 3C
Setup Guide Using Mi WiFi App