2-cycle engine features Super Clean air filter system to extend the life of the air filter. Automatic chain oiler, chain brake, and Quick Adjust chain tensioning system. Effortless pull starting system. Fully assembled. 2 year limited warranty. Replacement chain, model No. S56 (SKU 705756); 2-pack chain, model No. S56T (SKU 751643) ; bar and chain combo, model No. 27857 (SKU 705977); replacement bar, model No. 16S56041 (SKU 721776). Includes carry case.