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This 0.3M USB 2.0 to DC5521 step up cable comes with a convenient control switch, allowing easy switching between 5V and 9V output as needed. It converts standard USB power input into DC5521 regulated power supply, providing stable voltage for various small electronic devices. Compact and lightweight with reasonable length, it keeps your layout neat without messy wires. Adopted premium circuit and wire material, it ensures safe power conversion and long service life. Perfectly suitable for routers, mechanical keyboards, mini LCD monitors, mini speakers, USB cooling fans, tablet computers and more DC powered devices.