I have quite a few of these 5v power supplies. The lower amp ones & the apple have usb plugs/sockets built in. I measured the voltage measurements/outputs on them. Which is to say under no load conditions. Most one amp, one + amps units show 5.4 - 5.6 volts. An 'apple' unit "on label" says output is 5.1 v @ 2 amps, no load v = 5.7. A Radio Shack unit label = 5v & 2 amps measures at 6.5± v. I have (several) 2.5" usb cases which need 'external' (one of these warts) power. Computer usb... Read more Weiterlesen...