3 out of 4 didn't work

ordered 2 of them, neither one worked when they arrived. Amazon sent 2 replacements. 1 of them didn't work at all, the other works but I don't trust a product that only works 1 out of 4 times. I am sending all 4 of them back. Not sure if the batteries were all dead upon arrival or if the product is just garbage, but I'm not dealing with it either way.

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