Johnson Level & Tool Mfg. 40-6660 User Manual

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3. Sound Function
Pressing the sound key under power-on
status will switch the unit between
sound status and silent status, with the
sound sign indication on LCD.

Under the status with sound function on:
• If the laser signal is on the top (left) side, then the detector will

give single short alarm.

• If the laser signal is on the bottom (right) side, then the detector

will give double short alarm.

• If the laser signal is on the middle, then the detector will keep

long alarm.
Note: Whether under sound or silent status, the keys always keep
cue sound.

4. Power Save Function
When receiving no laser signal and no operation against keys for six
continuous minutes, the unit will power off automatically to preserve
battery life.

5. Low Battery Indicator Function
• When the power indicator sign is blinking,

this means that the battery is low and should
be replaced.

• Seriously low battery will result in automatic

power-off, which requires the user to
immediately replace before more operation.

Sound

Silence

Blink