Start your engine with the push of a button from up to 1500ft from your vehicle. The Pro StartTM PS-01 system is a 1-Way remote start system that uses (2) ultra-compact extended range 1-button transmitters to operate. Although there is no keyless entry feature on this system, the PS-01 has an unlock feature that allows the user to unlock the doors by holding the start button down for 2-3 seconds. Other features include a 2-Way data port, tachometer sensing, anti-grind and horn honk.