No documentation, fortunately there has apps.

Device shipped quickly. The documentation as a mini CD with incompatible type snap disk drives. Once this is solved the documentation is in English and generated with the demo version of a utility pages are also barred a watermark in the name of the utility that makes no ill of them illegible. So do not count on it.
The device's connection to the car is easy, watch the device appears to remain powered continuously even when the contact is not made, what about the battery?
It seems there is a Web server built into the device, but protected by a password. Unable to find the password in the doc, or guess. On the web there are people who have had the same problem in the past, but obviously the password has changed since the password they had found no longer walk.
Fortunately apps for iPhone requires a separate channel, and on this side connectivity is immediate and the device is easy to use.