The Most compact cordless die grinder available .3HP with an average of 20 minutes run time allows you to get the job done quickly with a single battery RPM Control for delicate grinding applications Use the M12™ REDLITHIUM™ battery which delivers up to 2X more runtime, 20% more power and 2X more recharges than standard lithium-ion batteries. POWERSTATE™ Brushless Motor outperforms all leading competitors with constant power output, yet runs cooler with no wearable components.