FUTABA T32MZ Instruction Manual page 74

The 'range check mode' reduces the transmission range
of the radio waves to allow for a ground range check.
*The range check mode, when activated, will continue for
90 seconds unless the user exits this mode early. When the
progress bar reaches 90 second mark, the RF transmission
automatically returns to the normal operating power.
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＜ System Menu ＞
74
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*Since the range of the radio waves is short, if the
model is too far from the transmitter, control will
be lost and the model will crash.
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