A mechanical key can be taken out from the top of the smart key, which can open the door. When you enter the car and press the one key start button, the car will not be started, and the words "key not detected" will appear on the instrument display. At this time, you can pull out the battery and step on the brake first. Press the push to start button for 3 seconds, and then put the car key close to the button, the car can be started in an emergency.
 Tips for using car keys
 1. Prevent forgetting to close the window
 When getting out of the car in a hurry to do something, they forget to close the window because of their hurry. At this time, many car owners will turn back to open the door, and then turn on the power to close the window. In fact, we can close the window by long pressing the door closing key on the remote key. In fact, the current mainstream car remote keys are equipped with this function.
 2. Reasonably control the opening of the door
 Press the Open key on the remote key once to open the cab door, and then press it again to open all the cab doors. It can effectively prevent the property on the copilot and rear seat from being stolen.
 How to start the car when the Sonata key is out of power
 Suggestion:
 one
 There is a place in the front armrest box where the key can be inserted to start the car.
 two
 The mechanical key can be used to start the vehicle, or the key battery can be replaced.
 three
 Stick the key to the induction coil.