Step-Hear CALL-HEAR CH-105-F, User Manual, Page: 11 / 76

INSTALLATION
The Indoor Unit (IDU) can either be placed on the
supplied stand or wall mounted.
To wall mount the Indoor Unit (IDU), drill two holes and
insert two screws 96mm apart. Leave about 5 mm of
the screw projecting from the wall. Guide the wall
mounting apertures at the back of the unit over the
screws and slide the Indoor Unit (IDU) downwards.
Caution: Ensure there are no electrical lines, water
pipes etc. in the wall where the holes are drilled.
Turn the Indoor Unit (IDU) on by turning the On/Off
Volume Control switch to the On position.
Pairing the Call Unit and the Indoor Unit (IDU)
The IDU can be paired with up to 4 remote units.
The pairing procedure is as follows:
1. Press and hold the IDU pairing/testing button until it emits a
beep, then release and the first LED lamp turns on. You
have entered into pairing mode.
2. Press and then release the pairing/testing button of the IDU.
The 1st LED lamp turns off and the 2nd LED turns on.
Press and then release the pairing/testing button again, the
2nd LED lamp turns off and the 3rd LED lamp turns on.
Press and then release the pairing/testing button again
and all three LED lamps turn on.
Now your IDU can be paired with up to 4 remotes in total,
each LED lamp represents a separate remote unit
and three LED lamps lit together represent the 4th remote
unit.