The black decker stc1820 cordless strimmer is fitted with a power select run time extender that increases the power for tough overgrown areas or reduces the power for lighter tasks to extend battery run time this efficient cutting system is powered by lithium battery technology and cuts up to 2500lm in one charge the e drive system provides a high torque gear system that powers through even the toughest overgrown areas quickly without clogging features trim n edge for easily converting from