This has a 650mah battery and can be used as a true pass-through using a 2 amp charger.(2.5 amp max). It features a blue led screen with battery level, volt setting and toot counter. 2 button, up and down, volt selector near screen, 3v-6v in .1v increments. eGo threading and a familiar eGo fire button. USB to mini USB cable for charging or PT. Threaded end cap screws off for use as a PT or to charge. Had it less than a day but I like it a lot already. The blue led reminds me of my ProVari and so does its performance. The puff counter is a nice feature also. I picked this up at this place -->http://www.free-cigs.com/Ego-Pass-through-VV-Stainless-Steel_p_126.html