Design and functionality are very promising and have convinced me to buy. The device has automatic, manual and Dry Clothes operation. Automatic mode is when more than 70% relative humidity "High", between 70% and 60% "Med" and 60% "Lo" corresponding LED turn. Less than 60% leuft only the fan, no dehumidification. Manual mode dehumidified according to the set timer: 8h, 4h.. or 2h. Dry Clothes mode runs continuously full power. The first unit of this automatic mode was not working, he showed "Lo" at over 70% rel. Room humidity and thus not dehumidified, so I can send it back. The Erstatzgerät what I subsequently received had more mistakes: the water ran onto the floor and little in the container. Automatic and manual operation left at the second device, the room humidity to 70% rise and gave still "Lo" when the measured value again, only worked the Dry Clothes mode. After this second failure, I asked my money back. For me, the automatic mode was essential because otherwise I constantly have to monitor. Now have a Commedes device purchased, though not as many functionalities as TTK 70, but a continuously variable Automatikentfeuchtung and functioning properly since being first switched. Shipping & pick-up service from Trotec not held also repeated an appointments. Give for the good design and functionality, despite promising double-frustrated experience still 2 stars.