Galaxy Quick charger needs 4.5-9.5V Max 0.8A, this pumps up to 12v at 2.1amps. It quick charges my iPad and iPhones and I love it. I drive an Audi A6 and the factory installed charger is a "slow" charger pushing less than 1.0amps on a 4.5 volt charge. So my immediate answer is "I don't know for a fact", but my educated guess is "maybe" and my experience says..."try it!" It is a good device. My kids broke one by raking a cleat across it, but after few chosen words and a few seconds of reflection...I went back online and bought another. I like that they are very "low profile" which brings into question why are my kids using their cleats on a 60k car enough to scrape off the face and guts of a cigarette lighter. I opt'd to think of my childhood and how I would have been hung, gutted and turned into jerky for the dogs....I kept my cool and merely decided the 10.00 was worth it.
The converter is needed when charging non apple devices in order to enable fast charging. If a charger is iPhone compatible it doesn't adhere to the USB standard and therefore requires this adapter or it won't charge your phone fast enough. It is actually really good of Satechi to include this. Most users will try another Apple compatible device and be disappointed.
Hi Mark-yes it does stay on when not plugged into a device. I unplug mine when I leave the car b/c I don't want my kids to decide it's theirs b/c it's unattended! I don't know of any converter that turns itself off.
if cigarette lighter is constant power will kil battery if car sits long enough my lighter on my motorcycle is only powered when bike is on hope that helps good product fast charge 20-min full charge Samsung s4.
Please see the link for the Smart Adapter:
Satechi Technical Support
It fits the Mini Cooper with a 1/16" gap under the flange -you can't really see the gap -but you can slide something very thin under the flange an tell it's not touching. It's the best (lowest profile) I've found for the Cooper.