This board is 5 string 3.7V/4.2V lithium battery protection board High current protection board, continuous 12A current Protection board with overcharge protection, over-discharge protection, over-current protection, short circuit protection. P+ P- is the abbreviation of PACK+ PACK-, that is, the output of positive and negative poles B+ B-is the abbreviation of battery, which is the positive and negative pole of the battery. PCB board size: (approx.)8.8x1.6cm/3.46x0.63"