The staircase timer itself has aimed for complex functions for alone there were 5 stars, only when the front light, a fairly loud buzzing around the 12KHz (measured) heard. It bothers quite strong and in the fuse box closed well still audible. Possibly it helps to insulate the door a little. The manual is a technical circuit ok But programming is not entirely conclusive. A conceptual explanation would be helpful here. Not everyone knows what TLZ, ESV, ES, IT, etc. means. I'm going to test first on and if it really bothers send back. PS: Even in the program by opening the fuse box, it does powerfully painful to the ears. But I am also quite sensitive terms which high tones. Others hear 12 KHz might even not more.
