HDMI switch is used in addition to AbleGrabber ™ where several input sources such as. (Apple TV and Laptop) should be connected to AbleGrabber ™ Projector
HDMI scaler is used in addition to AbleGrabber ™ where the Image Stream is larger than Full HD resolution (1920x1080p). It scales down from 4K resolution from HDMI to the port on the Smart-Board / Projector.