UPDATE, the seller contacted me and sent both replacements for the faulty ones, works really well, no problems with syncing or keeping the charge like the replaced ones. Great CS. I bought 3 packs and got a pack of 2 boxes. one with a box with 2 units on it and a smaller box with pictures on it with 1 unit, 3 look the same, same charging connector position, same shape. but for two the sensor LED was aligned left to right and for 1 right to left. 2 identical ones had no charge like the others and one of them stopped working after 3 weeks,
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