As stated in the description this is a great 3 battery charger. Simply plug in the batteries and off you go. The charger does the rest for you. It's easy to use and gives you peace of mind that your drone will be ready to fly in just a few hours. I would like to point out that it will NOT charge all three batteries at the same time. It charges them all one by one, receiving the battery with the highest charging priority in order. I know some people were upset that it didn't charge right away, but it doesn't, so it works as expected.