Key fob form factors.

The first question for any replacement fob purchase: which form factor does your vehicle use? Programming difficulty, aftermarket pricing, and battery type all depend on this answer.

736 vehicles Proximity Smart Key Push-button start with passive entry. The fob exchanges a continuous low-frequency challenge with the vehicle and unlocks doors as you approach. Programming almost always requires a scan tool with the vehicle's security PIN. 1396 vehicles Integrated Transponder Fob A traditional metal-blade key combined with an RKE remote in a single "flip" or "head" assembly. Includes a passive immobilizer transponder chip. Most years are eligible for onboard pairing with one working key. 413 vehicles Basic RKE Remote A standalone keyless entry remote that locks/unlocks the doors but contains no transponder chip. Pairs with the vehicle's body control module via an onboard ignition-cycle procedure. Common on pre-2005 vehicles. 261 vehicles Switchblade Flip Key A folding flip-key style fob with a spring-loaded blade. Functionally a transponder fob; the form factor reduces pocket wear. Used by VAG, GM, Mopar, and Hyundai/Kia across the 2008-2020 window.