When I try to charge multiple phones at the same time, they alternate between charging and turning off. Therefore, I recommend the manufacturer to redesign the USB circuitry or offer only a single USB port to avoid premature damage to expensive phone batteries. I have attached many clamps to my desk and this is the only one that has a bad grip. It crunches if you press it too hard. It probably needs a stiffer brace or bolt, or maybe a better grip at the contact points.
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