Multifunction 4 in 1 simultaneous HDMI display converter. This adapter allows you to connect from your small size HDMI input device (laptops, computers, etc.) to your large size HDMI VGA or DVI output displays (such as monitors, projectors, HDTVs) via HDMI VGA or DVI cable (required, but not included). Please note that you can connect 3 monitors simultaneously to your Windows devices. For Mac OS devices, HDMI and DVI cannot be connected together.Synchronous audio transmission: If you want to output sound through our adapter, please connect the 3.5mm audio jack of our adapter to your external speakers, then the sound will output from your speakers but if any of your monitors HDMI with audio output and built-in speakers, audio can also be transmitted directly to your HDMI displays along with video.1080p video output: When using our adapter, you can mirror the screen from your input devices to your external HDMI and VGA or DVI monitors. If you connect an additional display, all of your displays can only have one view. Maximum support for 1080p output resolution.Corrosion Resistant HDMI Connectors - Providing rigidity and improving signal performance. Easily view and share your videos, photos, games and more from your devices on any screen.Micro USB for power. If you connect to your Mac OS devices, you need to connect a micro USB cable from our adapter to your own USB devices to power our adapter. If you don't follow this step, your external monitors won't display anything. If you are using Windows devices, just connect the USB for power if needed.