Considering its 4800 claimed lumens, the Pro Cinema 1985WU is not overly large, rather a large portable (that weighs in just over 10 lbs.) It's smaller than most projectors for the home that cost as much or more. Its footprint is roughly 15 inches by 11.4 by 4.9 (including the feet). If you ceiling mount it, it will seem modest in size (very small compared to the similarly bright Epson G series Pro Cinema projector I use in my living room.) The projector has its manual zoom lens mounted off center, and has a door to cover it for protection when not in use.
The zoom and focus controls are on the top, as is the control panel and the slider for the lens cover which doubles as a switch to engage AV Mute, when the projector is on.
On the left side (viewed from the front) is the filter door, which hides the filter and also the receptacle for the provided wireless module.
All of the inputs are located in the back of the projector. Infra-red sensors for the provided remote control are located front and rear. Speaking of sensors. Also located on the front is a sensor (lower right if facing the projector) which is for the Focus Help and Auto Image size features.
On the top of this Epson, (see image), behind the lens controls is the Illumination sensor which allows adjusting the image based on the amount of light in the room. Next to it are Focus Help and Screen Fit. There is a drop down front adjustable foot in the center front of the bottom, and a pair of screw thread adjustable rear feet, for a nice stable 3 point stance if you are using the projector table top. The relatively powerful (compared to other projectors) 16 watt speaker is side facing - on the right side if looking from the front. This speaker has some real umph, and should be able to handle a fairly large classroom or fairly large training or conference room without outside help.