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Description: You can use this USB 18-LED Magnifying Glass Shape Small Desk Lamp Black easily and it is powered by USB port. No external power needed, just plug straight into your USB port to feel the light. Powerful but quiet operation. Low power consumption. Features: 4 USB 1.1 ports a type female connectors downstream 1 USB b type male connector upstream with a cable. Fully compatible with all USB devices. Compliant with USB (Universal Serial Bus) Rev1.0. Support both full-speed 12Mb/sec and low-speed 1.5Mb/sec transfer rates. Individual port over-current protection. Specified voltage: DC 5V. Specified power efficiency: 2W. Package : 1 x USB 18-LED Magnifying Glass Shape Small Desk Lamp