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External power adapter(optional) - Input: 100-240V~0.3A, MAX 50-60HZ - Output: +5V - 1.2A * The hub may be used without the optional power adapter with most USB devices. However, if you want to connect a peripheral that will consume more power, such as a CD-ROM/CD burner, external hard drive or printer, then you might need to use the optional external power adapter to support the extra power requirement of the device.
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