Across the back top of the HD72 home theater projector are seven bar like buttons, and two indicator lamps. Looking at the projector from the rear, from right to left: The lamp indicator, and a temperature indicator. Next is the Power/standby bar. Then after a space are the Menu and Select (enter) bars. another break and the down and up arrow keys, and finally two more bars, each with two functions. when the menus are in use, they are the right and left arrow keys. When you are not using the menus, one is the source (input) select. The other bar, labeled re-sync, triggers an auto adjust to provide the best possible image.
The bottom of the projector has 4 small recessed screw recepticles for attaching a ceiling mount. Optoma offers one, or you can use one of many universal mounts on the market. As Optoma chose small (metric, I believe) threading, make sure, if you order a 3rd party mount that it has the correct screws included.
Of particular note there is also a large standard thread recepticle for a tripod. This allows some interesting options. If you need to shel mount up high (which means the projector is inverted, this could allow an extremely small, and neat alternative to adapting a ceiling mount, or building a cradle. It's a nice touch, and I'd like to see Optoma offer a custom wall bracket that would take advantage of this. I all ready mentioned that there are two drop down feet, at the front left and right. An additional nice touch - there are two rear adjustable feet as well, both screw thread style.
That takes us, finally to the back of the projector, where all the inputs are located. Facing the rear of the projector, from the left:
- A 12 volt trigger for operating motorized screens
- A USB service port
- An RS-232 command and control port
- S-video input
- Composite video
- A component video input (Red, Green, and Blue RCA jack inputs)
- A DVI-I connector, which can handle a digital input, or analog computer
- A separate HDMI digital connector
- There is also the recepticle for the AC power cord and the master (hard wired) power switch
- Lastly, a Kennsington lock slot (for physical security).
Of important note, the HD72, is the only projector I have reviewed to date, with two digital inputs, a real plus for many users. Of course if you do plan to also hook up your computer, you will need the DVI-I for that. Note, you can buy a HDMI or DVI switch box, but they tend to cost about $250 or more at this time.