apparently only every 3rd device works without problems

This experience results from the order of 3 devices. The first I bought about 1 1/2 years ago, to give it away. According to the current owner it works, including the nearly 10 meters from the remote sensor is still excellent. The transmission overcomes even 2 concrete walls. It is very stylish and has a well-designed display of the measured data. Full marks *****!

Then I bought six months ago for another 2 units of the same design.

For a transmission from the outdoor sensor failed after a few days, although only a distance of less than 5 m and there is only a brick wall or a window is to be overcome. Usually, the measurement of outdoor values ​​should indeed be carried out outside a building. Only 1 Star *!

The second device was like a stubborn donkey just spontaneously to external values. In the first cold days, the failure rate was particularly high. A battery change brought some improvement first. But then remembered the stubborn "animal" back to his old familiar manners. Only 2 stars **!

Thus could the three devices on average rounded up to 3 stars are awarded, which seems to positively by the experience. Therefore, the rounding down to only 2 stars.

Since I have no experience in dealing with donkeys, I sent today both devices back, what thanks Amazon started off very intuitive and easily. Five stars for the service! *****