the Battery Equalizer is used for the 12V Gel/Flood/AGM Lead Acid Batteries which are connected in series to keep battery voltage balance. When two or more in series connected batteries are in charging/discharging/free status.The battery voltages maybe become different. One battery voltage is high and one is low.The battery equalizer wil equalize/balance the battery voltage when it detect there are 20mV between two batteries. It wil shunt curent from one battery (the higher voltage one) to the other battery (the lower voltage one). Until their battery voltage almost becomes same. This will improve battery's perfomance and extend battery's life time. Working Voltage:2x12V Working Current:0~5A Standby Current: less than 3mA Temperature Sensor:-20°C~+55°C Protection: reverse polarity protection Low Voltage Disconnect: 10V Battery equalizer can be used for 24V, 36V, 48V and any other N*12V batery system. 1 pieces for 24V sytem; 2 pieces for 36V sytem; 3 pieces for 48V sytem; Connection: 1. Black wire connects the negative pole of the series battery pack 2. Red line connects the positive pole of the series battery pack 3. The white line connects the intermediate connection points of the two batteries. Material:plastic colour:As shown Package Contents: 1 x Battery Equalizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.