Align describes this products as a 5.1V regulator. It's functionality is more of a voltage clipper in that it takes about .25v off the top of whatever you pass through it. If you have a servo that is a bit jittery at the top of the battery pack charge, you can use this product inline to clip off .25v and it will likely solve your problem. This is not a regulator, it's a useful product for some applications but like many things from China, not exactly what they say it is. ;-) SKU Number: K10381A