Python 671XP - Manual (Page 27)

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The receiver and 2-way remotes each use mathematical formulas
called algorithms to change their codes each time the 2-way
remote is used. This technology has been developed to increase
the security of the unit. The control unit knows what the next
codes should be. This helps to keep the 2-way remote "in sync"
with the control unit even if you use the 2-way remote out of
range of the vehicle. However, if the 2-way remote has been
pressed many times out of range of the vehicle, or if the battery
has been removed, it may get out of sync with the control unit
and fail to operate the system. To re-sync the 2-way remote
simply press of the 2-way remote several times within range
of the vehicle. The alarm will automatically re-sync and respond
to the 2-way remotes normally.
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Your system transmits and receives at 434 MHz. This provides a
cleaner spectrum with less interference and a more stable signal.
Enjoy a phenomenal increase in range – even in areas with high
radio interference.