The unit is very well made, the output powers seem to agree. Unfortunately, I noticed that the device absorbs the unused state on the 7 Watt and also still is a very unpleasant noise. The Viepen is gone as soon as load is applied, is loaded speak. Would be nice if at such a size to a charger energisparende electronics would be installed. In summary, an acceptable charger, which also eats so my power.