The box is buzzing now whenever we place in an outlet.**Update** the company is replacing this product. Once I receive the replacement and give it a good go I'll update again 10/20/1610/24/165 stars for customer service. 5Hey sent out a replacement charger when the 1st one began buzzing when in use. New one still has a buzz but nothing like the first one. I put dead batteries on at 330pm and by 8pm only 3 had their lights change to green. Took a few more hours for the last one to change to green (meaning charged)Its nice that you can charge 1 battery or 2 or 3 or 4. You don't need an even pair to charge.
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