Features: The Hexfly HX-403 charger is an easy to use multifunctional charger with built in LiPo balancing for 2S - 4S LiPo or LiFe batteries. You can charge two 2S batteries at the same time or one 3S or 4S batteries. - - - Detect current rate and capacity of individual cell Identify the Cell Count Automatically Auto Charger and Auto Cut-Off for Safety Temperature Protection Function. Adjust Charge Power Automatically when Overheat