1. Please confirm the button pattern for proper fitment, replacement for CTS 2008-2013. 2. M3N5WY7777A is the reference part number, it can achieve perfect match. 3. Color matching, parameters and specifications are customized based on the original factory, which is as sensitive as the original one. 4. Frosted texture and excellent hand feeling allow you to have a pleasant feeling every time you press the key. 5. Due to the original factory standard, directly replace the old or damaged one. Specifications: Item Type: Smart Key Material: ABS OE: M3N5WY7777A Chip: Integrated Purpose: replacement, spare part, 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 cell, CR2025x1 , 200mAh, (built-in battery) Fitment: Replacement for CTS 2008 2009 2010 2011 2012 2013 Package List: 1 x Smart Key Note: 1. Please check the part number of your item, the matching information is for reference only. 2. If you are not sure about the item, please contact us before purchasing to avoid unnecessary return, thank you 3. The remote must be programmed by a qualified locksmith to be programmed. There is no manual method for users to do it themselves. Please consult with some locksmiths in your area to ensure they will reprogram one of the keys for you.