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The iSDT line of chargers has proven to become a staple within the R/C community, meeting a wide variety of charging requirements, while doing so at a budget friendly price. The K4 is no different, delivering ample performance for most, a wide feature set, and simplicity that you come to expect from iSDT. The K4 duo charger can charge two batteries at once, and features both AC or DC input, so you can take it anywhere (or no where) to charge a wide type of R/C batteries! It's AC (100-240V) performance is healthy, delivering up to 400W of total charging power. When connected to DC (10-34V), this charger steps up a bit more, and can push up to 600W at each port to power your batteries!