Testing The Batteries; Using Earphones - Velleman CS100 Owner's Manual

TESTING THE BATTERIES

If the detector does not turn on, has weak volume, will not tune properly, has
erratic operation or drifts, test the battery power.
Rotate VOLUME away from OFF and set OPERATE/BATT TEST to BATT TEST.
If the pointer on the vu-meter is between 3 and 6 (green area), the batteries
have enough power to operate the detector. If the pointer is not in the green
area, replace the batteries.

USING EARPHONES

You can connect a pair of stereo earphones (not supplied) to the detector so you
can listen to it privately. Using earphones also saves battery power and makes it
easier to identify subtle changes in the sounds you hear for better results.
To connect headphones to the detector, insert the earphones' 1/8-inch plug into
the EAR jack on the side of the control housing.
Ear
Note : The detector's internal speaker disconnects when you connect earphones.
CS100 5 GB