They’re super cheap and come with a little sticky pad (there’s also screw holes) to mount them anywhere. They can simply be lifted off the base (holds itself with magnets) and used on a table etc by just turning.
The only downside is that they don’t show up in the Hue app and you just pair it with the bulb(s) that you want to control.
There’s a Youtube video showing how to pair them. You first pair them with the Hub so they’re on the same zigbee network then pair with the bulbs: