It provides power to HD-12C 1x2 2Port HDMI Splitter/Distribution Amplifier if it is not getting enough power from the HDMI port. NOTE: Must be used with HD-12C REV2 only. (Input Voltage: 100-240v 50-60Hz / Output Voltage: 5vDC 2Amp; Connectors: AC 2-Prong to DC; Color: Black; Length: 36 Inches)