1.Suitable for international AC 100V~240V. 2.Voltage balancing charging suitable for 2S 7.4V and 3S 11.1V lipo batteries. 3.Automatically correct out of balanced cells, and automatically charge cells with low voltage. 4.Auto-detected charge status display. (Red light: while charging Green light: end of charging) 5.Reverse polarity (warning beep) and short protection built in. 6.Aluminum alloy shell with internal cooling fan for effective heat dissipation. NOTE: 1.Do not leave the charger is operating unattended as it may cause a fire. 2.If the battery becomes hot while high current discharging or flying, please do not charge the battery immediately. Wait to cool down(about 20 mins), then inspect to recharge. If against follow the original factory using rules, possibly cause the battery to inflate or any dangerous accident happens.