Overcharge and discharge protection to prevent overcharge and discharge of the battery,Overcurrent protection to prevent abnormal high current of battery.Balance protection, battery voltage balance, make battery life , Stable heat dissipation, stable heat dissipation of the aluminum substrate, safety protection absorbs anti-high voltage, reduces MOS tube breakdown, ultra-low internal resistance MOSSuitable for most electric tools on the market, electric , electric bicycles, electric tricycles, electric motorcycles, electric vehicles, electric tools, etc.Different batches, product appearance and color may be different, does not affect the useType:14S 52V 30A 18650 Lithium Battery Protection BoardColour:blueMaterial:Metal+PCBPackage Contents:1 x Protection Board1 x cableOnly 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.