The integrated dual IC detects the voltage of each cell. And the number of uses Each battery can be detected and . Overheat protection, overvoltage protection, overvoltage protection, overload protection. The entire new for series achieves low voltage shutdown. Cooperate with many factories Stable quality and anti-vibration. It is the best partner of for wrench and impact drill and angle grinder. Colour:blue :plastic Package Contents: 1 x Battery Protection Board 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.