Electrical specs you mean, or did you mean that it uses a micro USB connector the same as the phone spec? Good point about the drooping supply voltage and that not all power supplies perform as rated - though I'd argue that you don't necessarily get what you pay for. When I got my Pi I had a choice of 3 different USB power adapters. First I tried the cheapy one I'd bought on ebay - claimed 1A which is more than you should need, but no surprises that the Pi wouldn't boot properly when I had stuff like a HDMI/VGA adapter attached also drawing power, and voltage was presumably sagging. Rather more of a surprise is that the 2A rated Apple branded adapter which came with an iPad also didn't work properly if I had other stuff drawing power from the Pi. My 1A rated Garmin adapter which came with my 910XT works fine even when I have lots of stuff attached to the Pi - will also happily drive servos at the same time provided I don't supply their power via the Pi (which causes the voltage to sag within the Pi even though the supply to it is OK). At some point I'll try and test the Apple adapter properly to see what happens, but it appears it doesn't provide a solid 5V when under significant load - the actual space for electronic bits is no more than the cheapy one, and a lot less than the Garmin, so my suspicion is that it is very much built down to a price in terms of power specs, even if it is electrically safe which you would expect to certainly be the case as it does have the appropriate markings. I suppose you could argue that the Apple one was cheaper as the Ipad was a freebie, but if paying retail prices it's certainly more expensive than a 910XT ;) Chris On Thu, Dec 26, 2013 at 3:08 PM, John Ferrell wrot= e: > FWIW, > The Raspberry Pi uses the same mechanical specs. Drooping supply voltage > can be a major problem. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .