On the left side (looking from the front are the various jacks.
Starting from the rear, is the 12 volt power input, and also a USB jack with 5 volt output. Per the manual, it can support up to 2 amp. 2 Amp, 5 volt is exactly what you need to be able to charge up an iPad.
Moving toward the front is an mini jack for audio out. There's good news, and bad.
The good, of course is you can hook up an external audio system, headphone or single speaker. The bad news, though, is that if you do plug anything into the audio out, it turns off the internal 1 watt speaker. My objection to this (one I have for many home entertainment projectors and other pocket and pico projectors), is that it makes it impractical to hook up a small powered subwoofer. After all, just a subwoofer, having no regular speakers doesn't work well.
That leaves only one other input: An HDMI input. I don't think I've ever seen a pico or pocket projector with only HDMI for an input, however you can input computer signals and video signals through HDMI.