Part Numbers/FCC ID: CWTWB1G767 Frequency: 433MHz. Note: Not a key shell, it is a whole key. Proximity Fob Fits for Smart Forfour 453 2015-2017, for Smart Fortwo 2015-2017 Pros of Our Keyless Remote: With built in chip, sensitive response, 6 buttons car key: remote locking, unlocking, panic, trunk hold. Fast response, wireless remote control. Notice Programming: This remote and door key must be programmed and cut by a qualified locksmith or dealership(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. This remote must be programmed and cut by a qualified locksmith or dealershipNeed to pay extra money for programming or cutting Package for Car Key Fob:1 x Car Keyless Entry Remote (Battery is included). Size: 6.5x3.5cm / 2.56'x1.38'(L*W). Please check OE number/FCC ID and product picture with original one before purchase.