Excellent brush upgrade, replaced both (there are 2) brushes because sweat got on the brushes and burned them out. With COVID being so prevalent I feel a lot more comfortable wearing them. One needs to be charged, I swap it out for another, so always have one on 24/7/365. sleep with them I cannot stress enough how their protection gives me peace of mind. If you are working bypass or direct to the public I would recommend you 1 or 2, this is the best but they have cheaper ones. The absolute highest possible recommendation.
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