The main function: Overcharge protection, over discharge protection, short circuit protection, overcurrent protection.Technical Parameters: Overcharge detection voltage: 4.25 +/- 0.05VOvercharge release voltage: 4.23 +/- 0.05VOver discharge detection voltage: 2.45 +/- 0.1VUpper limit continuous current: 4AOvercurrent detection current: 5ACharging voltage: 4.2VProduct Size: 35 * 4 * 2.2MMIC components: DW01 + 8205A * 2Wiring instructions: B +: Connected to the battery positive.B-: Connected battery negative.P +: For the battery pack output input positiveP-: For the battery pack output input negativeColor: greenmaterial: metalPackage included: 10 x protection boardOnly the above package content, other products are not included.Note: Light 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.