Hello claudiafer
There was no switch included with our purchase.
We use this switch (which is apparently not available from digitec at the moment):
Philips Hue dimmer switch
If I remember correctly, you can't change the colour with it, but you can set up colour profiles in the app, for example, which can then be activated with the switch (by pressing a button several times).
We use the Hue Bridge (if this is relevant).