Radarcan R-132 User Manual page 6

so that the batteries will not fall out.
2. Take out the dead batteries and insert the new ones, as
indicated in the battery compartment. Be sure to dispose
of the dead batteries in a special waste container for that
purpose.
3. Screw the cover back on and check to make sure the
indicator light flashes on every 15 seconds. If the
indicator does not come on, check to make sure the
batteries are correctly inserted and pointing the right
direction.