A keyless entry system for vehicles uses an electronic locking mechanism to control access to the vehicle. This system contains circuits for both transmission and reception, which work with RF modules that have quartz crystal oscillators to lock/unlock and start the engine in a manner that is automatic. The modern, keyless entry system not only works with a push-button start but also facilitates locking and unlocking of the car by just having the key fob in the pocket of the user, thus providing superior anti-theft protection due to the use of encrypted communication protocols.