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USB DC to DC 5V Voltage Step Up Boost Module
Product manual: Input voltage: 1V ~ 5V Output voltage: 5V (+ -5%) Output current: 300mA-500mA use: The module can use the 1-3 Piece ordinary battery £¬ or lithium battery input£¬ step-up to provide a stable DC 5V voltage supply emergency phone charge£¬ or for some of the 5V power supply of electronic equipment.