The rod with the red tip is the switch. Touch the metal part to turn the light on or off. Touch the red, insulated part to change the angle of the spot. Loop is not dimmable.Light source LED 4 W, 3000 K, 350 lm, CRI 90, not dimmable, EEC A+. The light source is not exchangeable by the user. Technical data 100 - 240 V, secondary 5 V. More info Available since February 2016. On display in our Munich and NY showroom and at Design Post Cologne. The rod at the cooling device is a touch sensor to switch Loop on or off.