Part Numbers/FCC ID: CWTWB1U511; Frequency: 315MHz. Note: Not a key shell, it is a whole key. Proximity Fob Fits for Ford Windstar 1999-2003, for Ford Freestar 2004-2007, for Mercury Monterey 2004-2006. Pros of Our Keyless Remote: With built in chip, sensitive response, 5 buttons car key: remote locking, unlocking, panic, left right door opening. Fast response, wireless remote control. Notice Programming: This remote and door key must be programmed and cut by a qualified locksmith or dealership(Need to pay extra money for programming or cutting)(consult some different locksmiths before programming to ensure it is successful).NOTE a working key fob was needed in order to add a new key. Package for Car Key Fob:1 x Car Keyless Entry Remote (Battery is included). Size: 6x3.8x1.3cm / 2.36'x1.5'x0.51'(L*W*H). Please check OE number/FCC ID and product picture with the original one before purchase.