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 MOS Suitable 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 use Type:13S 48V 50A BMS PCB Protection Board color:Blue Material:Metal+PCB Package Contents: 1 x Protection Board 1 x cable 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.