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What is a Smart Key Car Key? Also known as proximity keys as well as key fobs, remote keys, smart keys work to unlock doors and start engines without needing to insert a physical key. They communicate with radiofrequency signals. This helps keep vehicles secure by blocking hotwiring. Smart keys broadcast unique encrypted signals that block access to other vehicles. Convenience You can lock and unlock your vehicle without needing to insert the key into the ignition slot. Simply touch smart car key fob replacement on the trunk or door. A majority of modern cars also come with a feature that lets you to start your car via the internet. This is especially useful if you're bringing in groceries, or transporting passengers or equipment. This technology is designed to deter theft of vehicles. Instead of transmitting only one frequency signal like a traditional key fob does it sends out several encrypted signals to a car's embedded antennas as you come close to it. This blocks other cars from receiving and responding to the same signal. explain how Stuff Works Electronics. Furthermore, some manufacturers utilize a computer chip within the vehicle to identify the unique fingerprint of each key, which ensures that only authorized drivers use it. This is useful should you lend your vehicle to family members and friends. Some smart keys also store user preferences, allowing mirrors, seats and steering wheel adjustments, as well as stereo presets can be set automatically when the key is within reach of the vehicle. For additional convenience, certain smart keys can be configured to stop the car from exceeding a speed limit when it is activated with a specific key. This is a great method to ensure the safety of new drivers and also an excellent idea if you have children in the back. Security Traditionally keys for cars have been made from metal and used to unlock the ignition. Smart keys eliminate this requirement. Smart keys have a specific chip that sends an alert to your car's antenna. The car can detect this signal when the driver presses on the trunk release or door handle. This means that it's not possible to lock your keys inside your car anymore. The signal sent by the smart key to your vehicle is encrypted so that only you are able to use it. The majority of models will also turn off the engine if it hasn't been started for several minutes. This feature is especially useful if you're in an unsafe zone or need to leave the vehicle for reasons of any kind, like at a gas station. There are many systems that also have an alternative system for opening and starting the car when the battery of the smart key runs out while on a ride. The backup system typically involves putting the key in the slot or placing it in a certain area of the cockpit to transfer energy to an electric motor. Some manufacturers have a motorized key blade that can be utilized in a situation of emergency to open the trunk or to start the car. Battery Life The majority of modern cars have keyless entry systems and push-button starters. They are controlled by a smart fob which communicates with the car using proximity technology. These systems utilize a tiny transmitter, powered by a lithium coin-sized battery. Like all batteries that eventually requires replacement, this one too will need replacement. Even though smart key fobs are designed to last for a long time, they can suddenly lose power. If the fob is dead, you won't have the ability to unlock or start your car even if you hold it up close to the front door. It's not unusual for the transmitter of the smart key to drain the battery. It transmits a signal to the car every time you press one button, however most times, the smart key does nothing. A single signal to lock or unlock takes up a miniscule amount of the fob's battery power and that's several years worth of signals' worth of battery life for the average smart key battery. The fob can also drain the battery if you place it close to other devices emitting electromagnetic fields, for example phones and computers. These devices produce their own magnetic field, which can interfere with the fob's own transmitter and cause it to run slower. RepairPal states that the fob could stop working if it is placed too close to the gadgets. Maintenance Unlike the traditional metal car key, a smart key utilizes technology to control the locks on your vehicle and perform some other functions. It works by transmitting an indication from the fob to antennas in and outside the vehicle. These antennas detect the signal and communicate with your car's computer. The car interprets the signal, and allows you to begin or open it without the physical key. New vehicles are loaded with modern electronic features and the fob has become an interface for many of these functions. The most obvious are locking and unlocking, remote starting and chirping sounds that help you find your car in a parking lot. Some fobs allow you to save various settings for different drivers, and even remotely open windows and the sunroof. The transmitter itself is a sophisticated device that has an integrated circuit board, and it can be damaged by hard use or exposure to cold or hot. The transmitter could be damaged when it is knocked or dropped or smashed. The battery contacts can also become bent. These issues can be difficult to identify and repair. You can utilize your smartphone to overcome this issue to test if it works. However it is recommended to keep an extra key in your pocket in case. You can buy an ordinary smart key replacement for up to 70 percent less than OEM keys and comes with a three-year warranty.