Features 1) Replacement Ignition Module for Chainsaws 2) Replaces: Husqvarna 537162101, 503962402, 537162105, 537162104 and 503962406 3) Fits Models: Husqvarna 346 XP NEW EDITION, 346 XP, 340, 345, 350, 353, 359, 460, 461, 338 XPT, 339 XP, 340 E, 345 E, 350 EPA, 357 XP, 357 XP EPA, 359 EPA, 455 E, 455 Rancher; Jonsered CS2139 T, CS2141, CS2145, CS2147, CS2150, CS2152, CS2153, CS2156, CS2156 EPA, CS2159, CS2159 EPA, CS2255; Redmax G5300 4) This is a genuine Husqvarna replacement part sourced from the original manufacturer for use with chainsaws. The special ignition module is used to create an electric charge when the magnet on the flywheel passes the ignition module. The electric charge is sent to the spark plug to ignite the fuel/air mixture in the combustion chamber. 5) Husqvarna engineering brought your motor to life, trust Husqvarna designed parts to keep it living!