Since my previous universal power supply in Berieb is very hot, I needed a switching power supply. The part described here provides 7 levels voltages of 3 V to 12 V (1000 mA, 12 VA max.), With an input of 100 V to 240 V at 60/50 Hz. It is therefore necessary to use abroad. It is also suitable for iPod / iPhone (limited to 500 mA). The polarity can be switched. There are supplied coupling with 8 different input plugs (adapters), and a USB. The cable length is approximately 180 cm. This one is well prepared for almost any occasion. In terms of size the adapter about the size (small) is like a standard computer mouse. It looks solid processed, the switch can be easily but precisely adjusted. In operation, the power supply is barely warm. It makes no noise (hum or buzzing noise) and also secretes odors. Oh, and the devices that I have so far operated (USB hubs, cameras, radio alarm clock, external 2.5 "HD, etc.) are still alive and working smoothly. On the packaging are in English and German all the technical specifications and instructions for use noted . 5 ***** are - at a price of 10.85 - certainly adequate.