You can control the Yeelight device on the local network without any internet connection.
With it, you can control Power on / off, Brightness, Color, Saturation, and Color temperature.

Supported device:
> Lightstrip (Color)
> LED Bulb (Color)
> Bedside Lamp
> LED Bulb (White)
> Ceiling Light

Requirement:
> Smartphone/tablet and YEELIGHT devices connected to the same local network.
> Developer mode/LAN control enable for each devices.