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Determine the position of installation holes according to the marking
template and drill the hole.
Pry off the frame from the front panel.
Paste the cushion on the back of the front panel by the double-side
tape on the cushion.
Place the intercom speaker in the hole and fix it with four screws.
Connect the intercom speaker to the loud hailer using the color-coded
signal cable.
Make sure that every signal cable is firmly connected.
Mount the frame.
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