Arrived.
Do not buy as the product does not work. The picture is resistance of the 4 terminals which shows different resistance. The 4th resistance almost a short circuit and the remaining 3 has 6K resistance. It just heats up, overcharge and undercharge some batteries connected in series of a 48v setup. Seller gave $9.78 after a dispute was opened. I have lost money on a garbage brick. Buy at your own risk. And stop telling customers to return product when you know returning product costs as much as the product itself