They need to fit comfortably in a pocket or attach to a keychain, which leaves little room for a large antenna.
That compact design normally provides more than enough range for everyday use.
Drivers generally need the remote only when they are relatively close to their vehicle.
However, large parking lots, buildings, other vehicles, and simple distance can make the signal harder for the car to receive.
That is when the under-the-chin technique can become useful.
A Crowded Parking Lot Is an Ideal Situation to Try It
One of the most practical uses for the trick is locating a vehicle in a busy parking area.
After leaving a shopping center, stadium, airport, or other large location, it is easy to forget exactly where the car was parked.
Many drivers respond by repeatedly pressing the lock or panic button while walking through rows of vehicles.
If the car is slightly beyond the normal range of the remote, holding the fob beneath the chin before pressing the button may help the signal reach it sooner.
The sound of the locks, horn, or lights can then help identify the vehicle’s location.
It Can Also Help When You Forget to Lock the Doors
Another common situation occurs after a driver has already walked away from the vehicle.
You may suddenly wonder whether you remembered to lock the doors.
Walking all the way back is always an option, but the key fob trick may allow you to send the lock command from a little farther away.
If the vehicle responds, you can confirm that the remote is still communicating with it.
The additional range is not unlimited, but sometimes only a small improvement is needed.
The Effect Depends on a Working Remote
The technique only helps when the key fob is already functioning correctly.
If the remote has enough battery power to transmit a signal but the car is barely outside its normal range, changing how the signal is radiated may help.
If the key fob is completely dead, however, holding it beneath your chin will not restore it.
The same is true when the remote has suffered serious physical damage or when the vehicle’s receiver is malfunctioning.
The trick can improve range under the right conditions, but it cannot repair broken equipment.
A Weak Battery Can Still Limit the Result
Key fob batteries gradually lose power over time.
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