I have to say I really like this PV/Passthru. I am new here but have been vaping for a year now. I had various V4L passthrus and this by far exceeds it. The only down side to this is the male end of the USB that goes into the Trifecta sometimes needs to be turned or tapped lightly to keep a power connection as it has seemed to lose contact twice on me, but it's really no big deal. The battery is the size of a standard kr808d-1 XL battery. At first I thought it was rather long, but this IS a passthru as well as a regular e-cig, BUT the battery has lasted me all day thus far. Vapor production is GREAT, a tad more so it seems in manual mode but it's to be expected. Both auto and manual modes work great & flawless. I would recommend this to anyone, and with a price of 31$ it's not bad at all in my book. If anyone has any questions I will try to answer the best I can!