Connecting an external horn speaker.

There are two steps:

(1)	Strip the conductor ends, insert them into connectors 1 & 2 (EXTERNAL SPEAKER) on the left-hand side of the blue-coloured screw-terminal block and tighten the two screws.
(2)	Move the link on jumper J1 to the "EXT" position (the lower two pins).

Further details are available in the product's installation instructions.