XK531 Programmable Combo Door Lock & Alarm Control Interface w/integrated 1st gen. (97-04)Sentry Key RF Transponder Bypass. XK531 preloaded with upgradeable firmware (JDL) for 99-04 Jeep Cherokee. Primary control functions incl.: door locks, factory alarm, trunk/hatch release, door pin status output(-) & 2nd starter activation. Transponder chip included to bypass via RF induction using loop antenna.