RACK-Pro is the newer and a better version of Car Chabi. With the all new RACK-Pro, you have more control over your car. With the all new proximity, you do not have to tap any buttons at all. Just set the ranges and your car will lock and unlock at your specified range. Similarly, you do not have to tap the button to start the car as well. Just set the limits and your car will start and stop at your specified range.