Directed Electronics 110XV - Manual (Page 32)

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The receiver and transmitters use a mathematical formula called
an algorithm to change their code each time the transmitter is
used. This technology has been developed to increase the secu-
rity of the unit. The control unit knows what the next codes should
be. This helps to keep the transmitter “in sync” with the control
unit even if you use the remote control out of range of the
vehicle. However, if the remote has been pressed many times out
of range of the vehicle, or the battery has been removed, it may fall
out of sync with the control unit and fail to operate the system.
To re-sync the remote simply press several times within
range of the vehicle. The alarm will automatically re-sync and
respond to the transmitters 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.