Still draws power when switched off

I have two Ford vehicles that have constant power on the cigarette lighter outlets. On one vehicle I have an adapter which switches everything plugged in off and does not draw power, but it's large and I did not want to get another for my wife's mustang. The seller answered a question stating that the on/off switches were designed to prevent electricity loss. While not completely wrong as it does shut off accessories, it led me to believe that when switched off this would not draw power. I only wanted this so that I could leave a wireless fast charger mount plugged in with a switch to prevent power drain, but as far as I know this will drain as much or more power while switched off as the fast charger LED. I've had LEDs like this completely drain my battery when I leave for vacation and I would prefer an off switch instead of the wear and tear of unplugging and plugging in the accessory.

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