I've blown a fuse many times just to put it in the 12v socket. I changed the fuse every time. Doesn't quite fit in the cup holder. The unit works perfectly, the AC port powers my handheld vacuum well. The device stopped working after a month. As a technician, I recommend a model with a power switch. It doesn't appear to be able to handle voltage spikes when starting the engine, resulting in a short product lifespan.
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