I really wanted the Samsung Fast Charger 45 Watt for my brand new Samsung Galaxy phone. The first time I used the charging block on my brand new phone, I kept hearing my phone making the noises like the phone charger was being plugged up and unplugged and then plugged and unplugged, this was going on continuously. I was unsure if it was a new feature on the new phone or not, so I unplugged it and used another charging block. The other block charged just fine with no noises or acting funny. So that told me that it was the block and I am sending it back, but my issue might just be a bad one in the whole batch. I will get me another one to see if it was just a fluke thing or what because I have never had any issues with Samsung name brand.