easiest ways to distinguish between the two would 1) the LED colour of the puff counter, if it's red it's MVP 1, blue MVP 2.
the buttons at the side will read V+ and V- on MVP 1 and they will read P and U on MVP 2.
The easiest way is if the fire button is black it is a V1 and if it is Silver it is a V2. Never even noticed the LED color before and I own both, you made me look
