What's the difference between this and the Lil Sister.  Doesn't it have a 5v option.  You folks are really confusing me!
		
		
	 
Little Sister is a Variable voltage mod so you can dial the voltage to suit your atty from 3.4v to 7v depending on the ohms of the atty. I bought two GLV 2 PV's one of the caps has a resistor to regulate it to 5v the other cap has no resistor this is the small one, and uses one 3.7v battery. I can regulate my voltage with 
batteries on the larger GLV 2, with that cap I can use Two 3.0v 
batteries for 6v or two 3.7v batteries would give you 7.4v or use the cap it came with (with resistor) for 5v which I really like 5v 
vaping. For me it's all about how well made the GLV 2 is, it's comfortable and with the top mounted thumb switch it's a sweet PV for me. 
 
-Dan