Built-in dual IC detects cell voltage and tracks the number of uses. Detection and protection for battery: Overheat protection, overvoltage protection, undervoltage protection, overcurrent protection, overcharge protection. Stable quality and anti-vibration design. Ideal for use with Makita torque wrenches, impact drills, and angle grinders. PCB design may vary due to changes in supply chain and manufacturing processes. The white markings on the product are random; specific colors cannot be requested. Material: Copper clad laminate Color: Blue Package Contents: 10 x Lithium Battery PCB Board Note: This package includes only the items listed above. Other products are not included. Lighting and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.