The Cineroid Electronic Viewfinder offers an eyepiece view or an LCD view. The eyepiece/optical loupe can be flipped or detached completely to reveal a 3.2" LCD with an 800 x 480 resolution. 

Atop the eyepiece is a diopter adjuster. When you're in eyepiece mode, you can rotate the adjuster until the image in view becomes clear. For extending loupe length, an extension tube comes included to be placed behind the eyepiece. 

Connection to a camera and output to a preview monitor are both by HDMI. For monitoring audio, a speaker is built in and a 3.5mm headphone jack is also available. The EVF4C has a 1/4" screw-hole at its bottom. A great way to mount is by articulating arm via the 1/4" screw-hole. Otherwise, you can mount onto camera hot-shoes and tripods per an optional mini shoe-mount adapter.