German order product from China ...

Unfortunately, I did not know that Amazon also offers the device - it had acquired on eBay. However, there is the somewhat expensive version for 24V batteries - otherwise completely identical. It is intended primarily for the supply of a removed battery and can be screwed.
I do not need a device for permanent monitoring of the connected in-vehicle battery. My battery is removed during the winter months and to be then held bootable to avoid a deep discharge.
Who moved his vehicle in all seasons much, anyway not worry about such devices needs to make.

After a brief generation phase the device detects the battery voltage and automatically switches the required charge voltage. The display is very large and easy to read. The activity is limited to the essentials. The German-language instructions are for use of the device and its operation only scanty and partly incomplete evidence. But that is not absolutely necessary, since it is fully automated processes and operational errors are displayed.

On probation in practice I can give no final judgment - this will be completed in due time.
Four points for the first substantive impeccable execution and the very good display.