All USB connectors are designed with this in mind. Robust power connection - It's important for the power pins to make connection before the data lines, to avoid trying to power the device over the data lines.This is important to keep the signal intact in environments with a lot of electrical "noise". Shielding - USB connectors are shielded, such that a metal shell which is not part of the electrical circuit is provided.USB connectors are designed to transmit 5V, up to 500mA. These are for power, ground, and two data lines (D+ and D-). Four contacts - All USB connectors have at least four contacts (although some may have five, and USB 3.0+ connectors have even more). It may be possible to force a connector in wrong, but that will result in damage to the device.
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