Bought in good faith in November '15, as declared "bestseller" on Amazon. Brought in December for use - and satisfied so far. Then the evening in February, at which the step switch no longer worked and the ceiling made unusable. Returning to Amazon, I can no longer they that should have been made until the end of January. After the one or the other review of other fellow sufferers I decide against clashes with the manufacturer Medisana, dispose of the ceiling and never buy or recommend products of this company again.