1.Create a safe charging condition and maximum reduce the danger caused by negligence or setting error of user. 2.Synchronous buck&boost converter technology makes conversion efficiency up to 90%. 3.Accept all typs of RC/Drone batteries: LiPo/LiLo/LiFe/LiHV/NiMH/NiCd/Pb. 4.Easy to operate 5.Various of charging mode to meet different demand; 6.Perform 1-5cycles of C>D or D>C continually for NiMH/NiCd refreshing.