Spectra Precision HV302 - Mask Mode using the standard method; Mask Mode Activation

Mask Mode – allows you to electronically turn off the laser beam
(electronic shutters) in up to 3 lighthouse windows to prevent
interference with other receivers on the jobsite.
 To activate the mask mode on the + or -Y-axis, press the
button at the laser or remote control, then within <1 second press
and release the button.
 To activate the mask mode on the + or -X-axis,
press the button at the laser or remote
control, then within <1 second press and
release the button.
Note: The unit always powers up with the mask mode deactivated
(default).
Mask Mode using the standard method