New key fobs must be programmed with codes that the vehicle has to read before it unlocks the door or allows starting the engine.

A key fob with remote locking/unlocking and push-button start. A key fob with push-button start and keyless entry that owners can leave in their purse or pocket for virtually all functions.

Thanks to ididit and their id.PUSH+ Push Button Start Kit classic car owners can add the luxury of keyless entry and remote start in their classic rides.

If you have a key fob and have ever been curious about the circle arrow button and its function, here's what it means.

Some key fobs have many features built in that owners may not even be aware of. Here's our guide to hidden key fob features.