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I have used it for my satnav with antenna cable that require cigarette lighter socket. For some reason, only during charging via this adaptor, satnav will close itself and require restarting. Satnav is okay and runs fine on internally battery and when using via inbuilt 12v socket. It does work but this issue is really annoying, hence rating 3.
Works fine with dashcam so lets me use a double USB adaptor in cigar lighter to power dashcam and another item. Much easier and cheaper than getting a new dashcam with a USB connector already on it (and an easier alternative than hardwiring the dashcam to free up the cigar lighter)
The cable avoids loose connecting cables from your lighter socket to your Dash Cam it works perfect in my car (Mercedes) and avoids having to leave your storage area on the centre console open at all times. Excellent adaption