Feature:1. Used to maintain the charge and discharge balancing between each battery in the series battery.2. This product can compensate the battery in two directions, with reverse polarity protection and low voltage disconnection function.3. Can be connected in series in the battery for a long time to automatically maintain the balancing of the battery state.4. Intelligent battery voltage balancing system can keep the battery in a healthy state and prolong battery life.5. Great workmanship, can meet your use and replacement needs, very practically.Specification:Item Type: Battery EqualizerMaterial: Synthetic cardboardBalanced Starting Voltage: 3.0V-4.2VVoltage Termination Balancing: 2.9V (under voltage sleep state)Maximum Current Balancing: The entire error group is 0.1V1A; 0.5V3.5A; 1.0V5.5A (30CM 18awg test cable)3S Quiescent Current Complete State: (3 x 4.2V) 12.6V 12mAExternal Power Supply: No external power supply is required, and internal battery power transmission is used to transmit and balancing the entire battery pack.Working Environment Temperature: 0-60.Package List:1 x Equalizer1 x Line