High-performance lithium-ion battery technology for intense professional use. Makstar charging technology with digital communication: After a thorough assessment of its condition, the charging process is individually tailored to each battery for maximum lifespan of each cell. Two blades for a flawless finish. Large V-groove for easy chamfering. Adjustable knob with detents and scale for precise depth setting. Ergonomic handle with soft grip for high working comfort. Connectable to external dust extraction. Comes with two powerful 4.0Ah lithium-ion batteries, featuring electronic protection against overload, overheating, and deep discharge. Intelligent charging technology with optimized cooling system: reduced charging time (only 36 minutes for 4.0Ah) and maximum battery lifespan.