Lost or broken your Nissan key fob? No worries! This is a brand new replacement smart key that fits 2019-2023 Nissan Altima, 2020-2023 Versa, and 2020-2023 Sentra models with push-button start. It's a 5-button remote that matches the exact specs: FCC ID is KR5TXN4, the part number is 285E3-6CA6A, frequency is 434 MHz, and it uses a 4A chip. IMPORTANT STUFF: This key comes to you *blank*. It will NOT work right out of the box. You'll need to do two things: 1) Get the physical key blade cut to match your car's lock (any locksmith or dealer can do this), and 2) Get the remote itself programmed to your specific vehicle. Programming these Nissans requires special tools, so you'll have to take it to a qualified locksmith or the dealership – it's not a DIY on-board programming job. The fob comes with the battery pre-installed and tested. Before you buy, please, please check your old key's FCC ID and button layout to make sure they match this one. A quick call to your dealer with your VIN can confirm. Once cut and programmed, you'll be back to keyless entry and push-button start convenience!