Features Cell Balancer: Can test voltage difference between adjacent battery strings and transmit high volt to low volt to achieve voltage balance. Smart Testing: The automatic testing and starting will bring more convenience to your work, also has light indicator for better display. Accurate Work: Built in MOS with ultra low internal resistance as well as 0‑1.2A balance current and balance voltage accuracy within 30mv. Practical Use: Allows for application on Li ion NCM and for LiFePO4, the static power consumption is less than 20uA, safe and reliable. Easy to Install: Comes with a light weight and a compact size as well, the battery active equalizer has a cable for simpler connection. Specification: Item Type: Battery Active Equalizer Applicable Battery: Li ion NCM, LFP.  Single Cell Voltage: 3.0-4.2V Recommended Battery Capacity: Below 30AH Voltage Balance Accuracy: 30mV between adjacent voltages, typical.  Equalization Method: It is detected that the voltage difference between adjacent batteries is greater than 0.1V to trigger the equalization, and the voltage difference between adjacent batteries is less than 0.03V to stop working.  Balance Current: 0.1V voltage difference and 0.5A balance current, when the voltage difference is above 0.2V, the maximum balance current is 1.2A. Under voltage protection sleep voltage: The adjacent voltage difference is less than 0.03V and enter the sleep state. Quiescent Operating Current: 0.01mA Package List: 1 x Battery Active Equalizer 1 x Cable Note: 1. It is not recommended to be compatible with low strings, the indicator light will flash and report an error. Be sure to check that each cell is properly wired and insulated before connecting the balancing board. Otherwise it will short circuit and burn the board.2. If the battery is connected, it must be used with the BMS protection board. The charge and discharge voltage difference triggers the balance board to work to achieve energy transfer balance. Package List 1 x Battery Active Equalizer 1 x Cable