with all offers in comparison and considering various reviews came for me just a product brand, and here again Ansmann, in question. I do not need the power supply for a netbook, but for the power supply of LEDs. Stable voltage on duration is a must. The measurements yielded precise set voltage. The build quality is top. The price is low for the 50 W -version einews brand unit. The service, possibly nachzuliefern required plug is perfect. I can only recommend the device.