What is the function of the circular button on the car key?

[OKathryn]

The circular arrow button on the car key is used to start the engine. When outside the vehicle, first press the lock button, then hold down the engine start button for more than three seconds to start the car. A car key is a tool for turning the car on and off. Modern car keys all use chips, which are part of a magnetic chip system. There are three main reasons why a car key may fail: 1. Car key issues: During daily use, car keys may run out of battery. When driving, pay attention to how you use the car key—lock and unlock the car at a closer distance, as the farther the remote range, the more power it consumes. Avoid pressing the remote lock button multiple times when locking the car. 2. Car issues: When the car's battery is low on power. 3. Environmental issues: If the car is parked in an area with a strong magnetic field. Additionally, there may be intentional human interference, mainly from criminals deliberately using car remote signal jammers.