
They are amazingly delicate! But in the set I received they all work differently. After half an hour one of the five goes into a state in which he hardly recognizes me within walking distance, after a day's break he returns. (No heat at all. Is that related to charging?) Others are mostly good across the room. Too much difference in performance than expected. Consider them to experiment, they are great. If you want to complete the project, sort it out and choose the best one.

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