After being connected to a 12V battery for twenty minutes this charger switched itself off. I will keep it working to see if the product is faulty or has some kind of protection system. Will be updated in 35 minutes. went to check the product and not a single light came on, removed the clamps from the battery and turned off the unit. I waited about 15 minutes and plugged the device back in. The indicators did not light up, the product stopped working. Waste of $20 save your money and don't be me buy something really useful!
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