These inline USB voltage+current meters are fantastic and really cheap: I have bought like 8 of them and given some away to tech friends and=20 clients. With this device, I've been able to see exactly why a client's ipad will=20 charge with only one of several "1amp" USB adapters (the others collapse=20 at about 600mA), verified that a device I designed that charges at 90mA=20 does indeed do this for each of the 40 prototype units built, and can=20 clearly see how three "1amp" USB adapters (dealextreme $2 ea) output=20 5.3V that drops to 4.6V when the output current goes above 250mA (!!).=20 They're terrible and look identical of course to ones that work as=20 specified. You can watch the current go up as a cellphone charger=20 circuit draws more power, then the output voltage drops, then the=20 charger backs off, then the voltage goes back up, etc. Also great for quantitatively measuring how much better a $20 belkin=20 automotive USB charger is than a $2 from dealextreme. (Much better.) Just fyi all ... J Chris McSweeny wrote: > 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 suppl= y > voltage and that not all power supplies perform as rated - though I'd arg= ue > 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 --=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 .