Heath Consultants Sure-Lock Utility Pro - Manual (Page 17)

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of the operator. The second one is higher in pitch and corresponds to
the conductor being to the right of the operator. When the receiver is
positioned directly over the conductor, the speaker will null (produce
no sound).
Additional Connector
A
Figure 1-5
(Receiver - Additional Connector)
A. Accessory Jack
ACCESSORY JACK: The accessory jack is located near the handle and is
labeled ACCESS. This jack is utilized to connect to coupler clamps and other
accessories.