The instructions for use of the device is a little getting used to and we had to play around a bit until we could work with it without any problems. But then the thermometer has reliable, worked quickly and accurately. As described in other reviews, you have to press twice, once to start the thermometer, then you hold it at a distance of one to two inches in front of his forehead and pressed a second time. At hairless bodies can be so even without spasm and fight the body temperature of pets determine febrile children needs no wake, but it can measure short in deep sleep. Half asleep but they wake up, because the thermometer display lights sensibly what our feverish little scared real. It must be used with many small details well thought out and comfortable. If once you get used to it, one would not want to miss! Only the manual should be revised once more!