Save 15% until 29.11.2016 at John lewis with usual 2 year warranty. This is the cheapest I've seen the dimmer on its own. Usual price £19.99. Not a massive discount but if you plan on buying a few you could save.
A battery-powered dimmer for the Philips Hue system that controls your preferred light setting that you have configured in the Philips Hue app, without the use of your smart device.
You'll be able to smoothly dim your favourite light setting up and down. The Philips Hue Dimmer switch can be used as a normal wall switch.
You can place it anywhere you want, using screws or the adhesive tape on the back plate of the switch.battery-powered, so there is no installation.
Connect up to 12 Philips Hue dimmer switches to your Hue Bridge
CR2450 battery included
Battery lifetime - minimal 3 years
Dimensions wall plate: H4.5 x W2.76 x D0.55 inch; Remote size: H3.6 x W1.38 x D0.43 inch
50,000 click lifetime
Software upgradable when connected to the Philips Hue bridge
Dimensions H9.1 x W3.5 x D1.1cm