1998 1999 2000 2001 Mercury Mountaineer Remote Keyless Entry Key Fob with Simple Self Programming Instructions Keyless Remote for 1998-2001 Mercury Mountaineer Equipped with Factory Keyless Entry System Simple and Quick Do-It-Yourself Programming Instructions Included. No Tools Needed. Avoid Dealer Fees. Excellent Customer Service with Email Support. 30 Day Return Policy. Remote Tested Prior to Shipping with Working Batteries. Ships Within 1 Business Day. 3 Button Lock, Unlock and Panic.