I'm old so take that into account in my review. I like physically pressing the switch to turn it on or off. It's all an electronic charger that charged my truck's battery all night. The light was green indicating I assumed it was charging. Not correct. No instructions in the box. Worn up to a dead battery so far. This time I pressed the power button and the LED turned amber, which to me is a "warning" that something is wrong, so I changed it back to green last night. It would be helpful if an LED light came on to indicate charging, or even better an on/off button. I love my old Schumacher, but after 20 years it finally broke. Maybe it has to do with leaving it out in the rain for a week?
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