5.1-channel AV receiver with 4-in/1-out HDMI * Support for latest HDMI features like Audio Return Channel and 3D * Exclusive Yamaha home theater technology like CINEMA DSP and SCENE functions * Compressed Music Enhancer improves playback of your digital music library,Power Requirements: 120V AC 60 Hz * The design features a low-power standby and Auto Power Down with variable time settings