Folding Remote Key Fob 433MHz Battery For Smart Car Fortwo 453 Forfour 2015-2019 | eBay
Changing the key fob battery
Key fob three button including electronics with Blank Blade for Smart Fortwo 450 & Roadster 452
Remote Control Key Case for Smart 450 Fortwo Forfour 3 Buttons 433 MHz Frequency with Chip and 3 V Battery : Amazon.com.be: Electronics
3 Button Remote Car Key Fob 433MHz Chip For Smart ForTwo K City Roadster Forfour | eBay
450 Key Fob Battery | Evilution
Smart Key Fob Battery CR2450 for BMW Comfort Access Keyless Entry Remote | eBay
Ismartech Key Shell and Battery Cr1620 Case with Remote Control 3 Buttons Smart Fortwo 450 No Logo No Trasponder Shell + Blade + 3 Buttons + Battery: Amazon.de: Electronics & Photo