Otherwise, the devices are good: Large numbers, and the built-in clock even has an alarm function (although not mentioned in the "package insert" what should be the difference between the two alarm functions).
Batteries are not included, but it is also here on Amazon in the product description. Is irritating that the packs very well it says that batteries are in there.
The only thing that really bothers me: The shipping container is insufficient, and one of the devices was broken with me, because the hygrometer shows a constant 10% humidity at, even if the standing next to Swiss precision instrument to the 65% commutes. In this respect, the price per unit has increased from 6 to 8 scarce, at least in my case. When I have time, I'll see if I can open the thing and go to the error on the track, because return to the UK does not pay after all.