This is an Active BMS, it supports 3S-8S of and 4S-8S of LiFePo4 200A continuous current, It also has 2A active equalization current. It can set up the equalization voltage and the charge & discharge protection parameter through APP, It can display the single series of battery voltage After connected the BMS, use the power supply which is 5v battery voltage to activate it Product character: Active balance functionality, no need to lose the battery capacity to balance the voltage difference of sells, raise the battery usage efficiency for 95%. It can be used on 4-8s -/Cobalt acid lithium/Manganese acid lithium/Lithium iron battery packs. It has the protections of Over-charge/Over-discharge/Over-current and Short circuit etc. Working condition: Workable temperature: -20~70; Power requirement: 24V~100V, it could be worked by battery power or external Power supply; Power dissipation: In balance: 10mA & 100V, No balance: 6mA & 100V Notice: The 485 converter just for transfering the communication to be RS485, it can not be connected to PC directly, it needs to connect to another 485 module to connect to PC, The yellow wire is for 485A , the white wire is for 485B, the black wire is for GND and you 't have to connect the black wire, We will you the 485 protocol after bought the 485 converter, and we 't the software, if you are not the familiar with Serial Port Debugging Tool, be careful when you you purchase this product Balanced way: Active equalization Active equalization current:2A Internal resistance:1.3m Rated discharge current:200A Maximum discharge current:250A Overcurrent protection(Adjustable):10-200A Wiring :common port Monomer voltage range: 1V-5V Voltage acquisition accuracy: 5mV Battery cell Over-charge protection voltage :1.2V-4.35V(Adjustable) Battery cell Over-charge protection voltage: 1.2V-4.35V(Adjustable) Battery cell Over-discharge protection voltage: 1.2V-4.35V(Adjustable) Battery cell Over-discharge protection voltage : 1.2V-4.35V(Adjustable) Model Number: JK-B2A8S20P Accessory Type: Battery Accessories Set: B color:As shown Material:metal+plastic Package Contents: 1 x Smart BMS( 4-8S BMS heat port) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.