Honda Monkey 2021 Owner's Manual page 94

Keys
The alarm system and answer back system may
not work properly in the following environments:
There is strong electrical current nearby.
●
You carry a cell phone, a laptop computer, or
●
other electrical device.
The remote transmitter is touching or covered
●
by metal.
90
The battery in the remote transmitter normally
lasts about 2 years.
Do not keep mobile phones or other radio
transmitting devices in luggage box. The radio
frequency from the devices will interrupt the
alarm system and answer back system.
You should always keep the remote transmitter
on your person.
Anyone in possession of the remote transmitter
can operate the alarm system and answer back
system.
To add an additional remote transmitter, take
the remote transmitter and the vehicle to your
dealer.
The remote transmitter uses low-intensity radio
waves, so the operating range can be wider or
narrower according to the circumstances.