Why is the remote control distance of the car key fob short?

[VanEsther]

The short remote control distance of a car key fob is not only related to the transmitter, battery level of the key, and the car's receiving antenna, but also to obstacles around the car such as trees and walls. Additionally, interference from other signals, such as mobile phone signals, signals emitted by other car keys being used simultaneously, and surrounding WiFi signals, can also affect the range. If you notice that your car's remote key has a significantly reduced range, you can try testing it in a different location. The working principle of a car remote key is that it first emits a weak radio wave from the key, which is received by the car's antenna. The electronic control unit then identifies the signal code, and the system's actuator performs the locking or unlocking action.