Battery you need - https://amzn.to/2lg5riJ

Hyundai Part Number: 95440-F2000 , 95440F2000 95440-F3000 , 95440F3000
FCC ID: CQOFD001201
Freq: 433 Mhz
Fits: 16 17 18 Hyundai Elantra (with push to start). PLEASE NOTE there are multiple options for 2018 model. Check your part number. New Uncut Emergency blade insert is included 81996-B4520

This key fob has been used on several Hyundai cars, starting from around 2012. It has been introduced in several years, depending on the model.