far too long delivery times. Could be that Article Made in China. But if the display is not visible. Have ordered mid February and is expected until mid-March. Delivered. Completely unacceptable. You can learn about the function until the receipt, what I will do. 10:03. Have appliances by registered mail from the NL received. Now the curious. The gas detectors are working properly! Goods well packed and without batteries. There is still a star.