Makita LXDG01 18V LXT Lithium-Ion Cordless 1/4 inch Die Grider (Tool Only) Makita built motor develops 25,000 RPM's for faster grinding Slide switch lock on for operator convenience Vent slots designed to direct exhaust air away from user LED light flashes red when it is time to recharge the battery This tool is not equipped with Star Protection, and is only compatible with the Makita 18V LXT Lithium-Ion 3.0Ah battery (BL1830, sold separately).