What are the differences between Pioneer AVIC F840BT and F940BT???

I'm interesting buy one, but i need know the differences

Thanks!

the f840bt is the oem version that was factory fitted to Nissan cars. apart from the model name it has all the same features of the f940bt

Thanks friend. But only OEM version for Nissan, i see in Volkswagen workshop mount too F840Bt...¿?

The only difference i've noted is a single AV output

I have a F840BT.  It is the OEM version of the F940BT, which means this is the version that comes factory fitted in some cars.  Sorry, I cannot remember which.  If you look at the manual for it, it is the same one for the F940BT too.