I ordered a few 12 volt solar chargers. When they arrived, I tested them and both of them were reading voltages much higher than 12 volts. At 12 volt battery can be topped off at over 14 volts but these are reading nearly 20 volts. I have hundreds of dollars of batteries that I was hoping to keep charged with these if I would have plugged them in it would have destroyed my batteries. I spent nearly an hour on chat with timu and they would not refund my money. I believe the seller knows that both of these items are falsely advertised and is scamming customers. On top of that the items took over a week longer than they were supposed to.