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Suitable for electronic devices with 3.5x1.35mm interfaces such as speaker, small fan, lamp, and cleansers. USB 5V input, 5V 3.5x1.35mm output. USB to DC3.5x1.35mm , 5V charging , providing convenient solution for charging various electronic devices. Craft from materials, resistant to bending, not easily broken, and with long service . Internal is electrode and external is negative electrode of the interfaces.