Details Compliant with HDCP 1.3 Supports multiplexed HDMI 4-input and 1-output Supports up to 1080p high definition resolution Support 4 by 1 quad multi-viewer and seamless switch (with same resolution) Support scaler up, scaler down function Support multi output resolution Support digital audio format LPCM/AC3/DTS Support manual control and IR remote control Support USB upgrade