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# The our ring is negative# The outer ring is negativeHewlett-Packard Company is not forthcoming with detailed information about the Smart Pin. What you will find here is some details based on testing and user data.== Equipment Testing ===== HP Pavilion dv7-4276nr Laptop -w- OEM PPP012A-S AC Power Adapter ===The AD Power Adapter is PN: 608428-004. This adapter has the center Smart Pin. 19.40 VDC