optical top !! Radical is unusable. 4 stages: 1-2 ineffective 3 goes on, 4 more but turned automatic after 10 minutes. down to level 2. Is not one nearby, evaporate the kitchen cabinets and the water runs into the food. That makes it anyway, when cooking on the front panels, he fails to deduct the haze, condensation runs down and drips into the rear pots! The lighting illuminates more than the back wall, but never the hob. Absolutely useless! Conclusion: For the price (got it for 870 bought) is the absolute Frechhei! Hands off! Have complained !!