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Use this cable to extend low current power from components with a coaxial power output jack eliminating the need for an extra power supply. Dual screen portable DVD players have a 12 VDC output jack to power an extra monitor. If you don't need the extra monitor, send 12 VDC to an external powered speaker to enhance the sound quality. The 1 ft. cable is the perfect size to send power to stacked components, eliminating the need for an extra power adapter.