digital zoom. 

This projector doesn't have a built-in battery, but they provided a power adapter in the package. 

All you need is an aux cord to plus in to the projector straight to the speaker. 

If you are not getting a picture what so ever from your phone its most likely the cable you are using to go from your phone to projector would recommend getting the apple certified lightning to hdmi 

The adapter will mount the lens and you will be able to use it manually. However, my copy of the adapter does not allow the lens to be fully mounted all the way until it clicks into place. It doesn't quite make it, but it's still very solidly mounted. Also, the manual aperture linkage doesn't work properly (on my copy, at least) so exposure is controlled only by shutter speed and/or ISO. You will be able to manually focus and zoom the lens but no VR, of course. It will be a frustrating experience. Instead, get a 14-140 Panasonic zoom if you can afford it!