Greenworks 13-Inch 40V Cordless String trimmer, Battery Not Included 21332 Gas free cordless design eliminates the gas hassle while getting the job done Lighter, reliable, easy push button start will not wear your arms out. Spool type: single Pivoting head allows for edging and trimming capability with edging wheel; 40V G-MAX and 40V Lithium-Ion Batteries are not cross compatible. Compatible GreenWorks Replacement Spool, Model 29252 and 29092 Battery sold separately. Compatible with battery models 29462 and 29472 and charger 29482