There's kinda 3 kinds of usb cable 1. data cable that maxes out at 500 ma for charging 2. charge only cable that shorts the data wires so you can charge at 1a but is unable to transfer data (sync with a computer) and 3. which is a combination of the 2 previous types. It is kind of hard to tell what you're getting when you buy them but the cable itself should be at least 28awg in order to support 1a charging. Sometimes the product descriptions will mention it but the only way to truly know is to just plug in the cable. A lot of older cables 4+ years old will be the type that will only max out at 500ma. You should be fine if you bought a cable recently or bought a smart phone that included a micro usb cable.So said cable is usb that people from other countries can use ?