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What is a Smart Key Car Key? Also known as keys that are in proximity as well as key fobs, remote keys, smart keys function to unlock doors and start engines without the driver having to insert the physical key. They communicate with each other through radiofrequency signals. Apart from that, it helps to protect cars by preventing attempts at hotwiring. Smart keys also transmit unique encrypted signals to prevent them from being used by other drivers' vehicles. Convenience You can lock and unlock your vehicle without the need to insert the key into the ignition slot. Simply tap the door handle or trunk. Many modern vehicles have a feature that allows you to start your engine remotely. This is particularly helpful if you are bringing groceries in or transporting passengers, or equipment. This technology is designed to protect against theft of vehicles. Smart keys transmit encrypted signals instead of a single frequency like a normal keyfob. This blocks other cars from receiving and responding to the same signal. This explain how Stuff Works Electronics. Additionally, some manufacturers utilize a computer chip within the vehicle to recognize the unique fingerprint of each key, which makes sure that only authorized drivers use it. This is useful if you lend your car to friends and family members. Some smart keys can save user settings, meaning that the seat, steering wheel, mirror and stereo presets can be automatically set when the key is within reach of the car. For added convenience, some smart keys can be programmed to stop the car from exceeding a particular speed limit when activated with a specific key. This will help keep new drivers safe and beneficial for families with young children in the back of the vehicle. Security Traditionally keys were made of metal to open the ignition. Smart key technology eliminates this requirement. Smart keys are equipped with a chip that sends an antenna signal to your car. The car recognizes this signal when the driver presses the button on the trunk release or door handle. This means it's impossible to lock your keys inside your car any longer. The signal sent by the smart key to your vehicle is encrypted so that only you have access to it. The majority of models also shut off the engine if it hasn't been started for some time. This feature is particularly helpful when you are in a risky location or need to leave your vehicle for any reason. Many systems also have an alternative system for opening and starting the car when the battery of the smart key runs out while you are on a ride. The backup system typically consists of placing the key into the slot or placing it near a specific part of the cockpit, which transfers energy to an electric motor. Certain manufacturers also include an key blade that is an emergency mechanical lock in the key that could be used to open the trunk and start the car if needed. Battery Life Most newer cars have keyless entry and push-button start systems that are controlled by a smart key fob, which uses proximity technology to connect with the car. These systems are powered by a small transmitter which is powered by a lithium coin-sized battery. It will eventually have to be replaced like any other battery. Most smart key fob batteries last several years, but it doesn't mean they won't go out of power and stop working suddenly. If smart car key fob is dead, you can't unlock or start your car even if you put it close to the front door, and the key fob's light blinks. It's not uncommon for the transmitter of a smart key to drain the battery. The smart key transmits signals each when you press the button. However, the majority of the time, it doesn't do anything. The battery of a smart key is large enough to last for several years of unlock and lock signals. The fob also drains the battery if kept near other devices that emit electromagnetic field, such as phones and computers. These devices emit magnetic fields of their own which can cause interference and slow down the fob transmitter. In some cases, the fob may even be unable to function when it is placed too close to these devices, as per RepairPal. Maintenance In contrast to the traditional car key, a smart key uses technology to manage the locks on your vehicle as well as perform other functions. It works by sending an indication from the fob to antennas in and outside the vehicle. These antennas sense the signal and communicate with your car's computer. The car responds to the signal and allows the user to open or start it without using a physical key. New cars are loaded with modern electronic features and the fob has become a hub for many of these functions. The most obvious uses are locking and unlocking your car, remote starting and chirping noises to help you locate your car in a parking area. Some fobs even let you store specific settings for various drivers, as well as remotely open windows and sunroofs. The fob is a complicated electronic device that includes an integrated board that can be damaged if it is used too hard or exposed to extreme heat or cold. The transmitter can break if dropped or banged. The battery contacts could become bent. The issues are often difficult to pinpoint and repair. You can use your smartphone to solve this issue and determine if it's working. However, you should always keep an extra key in your wallet in a case. You can buy an equivalent replacement for the majority of OEM smart keys, which can cost up to 70% less and comes with a 3-year, better-than-OEM guarantee.