Item Type: Smart Key Material: ABS OE: M3N5WY7777A Chip: Built-in Purpose: Replacement, Spare, etc. System: BDC/CAS4/CAS4+ FEM Buttons: 5 (Car door lock button, unlock button, trunk lock button, speaker switch button, remote start button) Battery: Button battery, CR2025x1, 200mAh, (built-in battery) Fitment: Replacement for Cadillac CTS 2008 2009 2010 2011 2012 2013 Package List 1 x Smart Key 1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks 3. The remote control needs to be programmed by a qualified locksmith in order to be programmed. There is no manual method for users to do it themselves. Please consult some locksmiths in your area to make sure they will reprogram one of the keys for you. 1Please confirm button pattern for proper fit, replacement for Cadillac CTS 2008?2013. 2M3N5WY7777A is the reference part number, it can realize a perfect match. 3Color matching, parameters and specifications are customized on the basis of the original factory, which is as sensitive as the original one. 4The frosted texture and the excellent hand feel allows you to have a pleasant feeling every time you touch the key. 5Due to the original factory standard, directly replace the old or damaged one.