Aqara Cube Guide Rapide page 3

Quick Setup
1. Please add the Hub to the app according to the Hub
Quick Start Guide.
2. Please open the app, tap "Home" and then tap "+" in
the top right corner to enter "Add Device (Accessory)"
page. Select "Cube", and add it according to
instructions.
* If the connection fails, please move the accessory closer to the
Hub and try again.
Effective Range Test: Single swing the Cube or single
press the reset button in the Cube. If the Hub makes voice
prompts, it indicates that the Cube can communicate
effectively with the Hub.
* Avoid metal surface to maximize signal strength.
https://manual-hub.com/