The adapter fits perfectly in two charging sockets of my truck (MB Atego) and as mentioned in the product description. The bracket allows easy removal of the adapter, but has no lock function as you possibly could mistakenly assume.
The adapter has two USB ports, which are arranged one above the other. The pins in the two USB ports are arranged so that they point towards the center of the adapter respectively. This means that the overhead USB connector is "normal" is inserted and the lower plug the other way around. If both USB plugged plug, is still about 1 mm space between the plugs. The connectors are seated perfectly, but can be easily pulled out again without the adapter is pulled with equal from the charging socket.
The loading speed individually connected devices is perfect, no matter what device is connected. The Plantronics headset invites within 2 hours from 0 to 100%. The iPhone 4S I use during breaks or longer periods ever for video telephony. While you can watch on battery power, how this changes the charge state of the battery down, when using the adapter and an Apple charging cable remains the state of charge at the same level.
The pure charging without active use of both iPhones felt lasts no longer than at home with 220V. The same applies to the iPad2 occasionally used by me as an eBook. Mind you: The data always apply to a single connected device. So far I had only one headset and iPhone simultaneously connected for charging. Then, charging takes longer. For me it was important that I can take care of multiple devices with enough power and exactly meets the adapter without restrictions.
All in all, for me the purchase worthwhile. Gone are the days of countless different charging cables, connectors, adapters, etc. All equipment used by me have a charging cable with USB plug. The adapter is now permanently in the charging socket, thereby increasing the number of existing in my truck loading facilities from 2 to 3 units.
Another important criterion in the purchase is the expected service life. So far, even high-quality / high-priced adapter renowned manufacturers have already failed after a short time the service. The cables have always held. Alone the built electronics is probably not designed for permanent use in 24 volt voltage. The adapter-reviewed here since 3 months now holds the daily use without any indication of an overload etc.
I can therefore recommend buying this adapter, even if "only" a single device connects or adapter needed only occasionally.
