3) Insert a fresh 9 volt battery and snap the (+) and (-) terminals to the
unit’s battery clip. Do not try and reverse the terminals. The battery will
only fit one way.
4) Replace the battery compartment cover and tighten the retaining screw.
The unit is now ready for use.
THE VIEWFINDER:
The NG3900 uses a sophisticated 10 power roof prism optical system.
Objects appear 10 times closer than seen by the unaided eye. Look towards
the subject you wish to observe and turn the rubber focusing ring around the
eyepiece until you see clearly.
The viewer is equipped with a fold-down rubber eyecup. When this eyecup is
rolled down eyeglass wearers will be able to see more of the viewing area.
USING THE LISTENING FUNCTION:
1) Plug the headphone into the headphone jack.
2) Aim the unit at the desired subject.
3) Squeeze the on/off switch. You will now hear an amazing wealth of
amplified sound.
THE FREQUENCY CONTROLLER:
When you are listening to amplified sounds you may notice that unwanted
background noises, such as the rumble of traffic, is annoyingly loud.
The Frequency Controller (See Picture 3) can reduce these unwanted
sounds.
(Picture 3)
