Question edited for clarity, and spelling 'brain' to Braun, and 'thermoter' to thermometer, 'comes in' to comes on..
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There are some ideas here, but it sounds faulty and needs warranty return or repair.
https://www.google.com/search?q=Braun+thermoscan+hm3+not+working
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Question edited for clarity and better written English.
Yes it seems to be a very good buy. Just go to the Amazon page and read the reviews.
https://www.google.com/search?q=HAPPRUN+Projector
Probably worth paying the extra $10 for the upgraded version $109.99.
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