Is lag an issue with these? Seems like most bluetooth devices have at least some noticable amount of lag between the time that something happens on one end, and what you see or hear on the other. That could be HUGE for a backup camera.
I have been thinking of using an old iPhone or iPod touch coupled with my current iPhone in a facetime conference as a make-shift backup camera. It seems that all I would need is a magnetic mount to slap on the tailgate of the truck, aim it to view the hitch ball, and BAM! ... instant back up camera. But what has me second guessing that idea is lag.
If you want an example of what I'm talking about, try playing any game app with your smart phone playing audio over a bluetooth speaker. There will often be a noticable gap in time between when you tap on something on the screen and the sound you hear out of the wireless speaker, especially compared to what you normally hear when listening directly over the phone speakers or a wired headset.
Lag in a backup camera could lead to overshooting your mark, or worst case, ramming your rig. Not good.
So, needless to say, I am curious about the potential for lag in a solution like this (or my facetime idea).
