Not much with this device. It comes with a replaceable fuse, but the inverter needs to be disassembled to replace it. Of course, you shouldn't blow a fuse, but it happens. To unscrew it, use pliers to remove the old one and install the new one, being careful not to damage anything. Complete failure here. The next is the most annoying. When it turns on or is powered by 12V it activates the internal siren/buzzer. Keeping it connected to your car means you'll hear it every time you start your car. The latter is annoying. If you look at the LEDs, they say blue is fault and red is power. However, the opposite is the case. You must read the manual to know this. Obviously this is an issue when they print it on screen, but it will confuse people. All in all I could live with the 1st and latest release but not the 2nd release with Siren. Don't waste your money on it. Update on my review: The seller contacted me and offered to pay me to have this review removed. This is a violation of seller Revain's rules. My review was honest and correct. I would avoid all products from this seller and strive for better customer service.
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